Concept

The Devil

Intro

The devil shows up in Eden as the talking serpent, in Job as the accuser standing in God's court, in the wilderness as Jesus' tempter, and in Revelation as the dragon thrown into the lake of fire. The Bible has more than twenty names for him, each one a job description rather than a label: tempter, accuser, deceiver, slanderer, ruler of this world, father of lies.

The Christian answer to "what is the devil" is precise on three points. He is a real person with intellect and will, not a metaphor or a cosmic force. He is a created angel who turned, not an evil deity that has always existed. He is finite, allowed to act only inside God's permission (Job 1:12), and already defeated at the cross (Col 2:15). Christianity is not a tie between two gods; it is a creation that was broken by a rebel and is being put back together by its King.

This page walks through the names, the nature, the contested Lucifer question (the Day Star passage in Isaiah 14 may or may not be him; tradition mostly reads it as him), the wilderness temptation, the cross as his decisive defeat, and the final scene in Revelation 20 where he loses for good.

If you came here from a Google search for "Satan," the keyword-shaped landing page is Satan. This page is the deeper doctrinal treatment.

In full

The deep doctrinal hub for the figure Christianity calls the devil, the chief of the rebel angels, the spiritual adversary of God and humanity, the Tempter in Eden and in the wilderness, the Accuser in Job and Revelation, the Deceiver of nations who is finally cast into the lake of fire (Rev 20:10). This page treats the devil's names, nature, origin, mission, interactions with humanity and with Christ, the church-father reading, the contested Lucifer question (including the lesser-held theory that Lucifer is one of Satan's high-ranking angels rather than Satan himself), the five-generals-of-hell framework from the charismatic deliverance tradition, and the biblical eschatology of his end.

For the keyword-shaped search-landing on "Satan," see Satan. This page is the doctrinal hub; that page is the entry point for someone googling the name.

The names, every major biblical name and what each carries

The devil is named more by function than by proper name. Each name reveals a facet of his work.

Personal / proper-name forms:

Satan (śāṭān, "adversary"), Hebrew; ten OT occurrences as a personal-figure title, scores of generic-adversary uses. Job 1-2, 1 Chr 21:1, Zech 3:1. In NT Greek transliterated as Satanas. The Aramaic the historical Jesus used; the word He addresses in the wilderness ("Begone, Satan!" Matt 4:10).
Devil (diabolos, "slanderer," "false accuser"), Greek; the Septuagint's translation of śāṭān where the figure is personal. Used 35 times in the NT. Matt 4:1, John 8:44, 1 Pet 5:8, Revelation 12.9. The English "devil" is a direct descendant.
Beelzebub / Beelzebul (Beelzeboul), "lord of the high place" or, polemically, "lord of dung" / "lord of the flies." Originally a Philistine deity of Ekron (2 Kings 1:2-6). The Pharisees use it against Jesus as a slur claiming He casts out demons by the prince of demons (Matt 12:24-27; Mark 3:22; Luke 11:15-19). Jesus accepts the implication that Beelzebul is Satan and turns the slur against the slanderers: "a kingdom divided cannot stand."
Belial / Beliar (beli-ya'al, "worthlessness," "wickedness"), OT used as personification of wickedness (Deut 13:13, "sons of Belial"; 2 Cor 6:15, "what concord has Christ with Belial?"). In Second Temple Jewish literature (Qumran, Jubilees) Belial is a named demonic leader. In the NT 2 Cor 6:15 treats Belial as Satan's name in opposition to Christ.
Apollyon / Abaddon, "destroyer" (Greek Apollyon; Hebrew Abaddon). Rev 9:11, "the angel of the bottomless pit," king of the demonic locust-army. Some readings identify this with Satan directly; others treat Abaddon as a high subordinate. The codex notes both.
Lucifer (Latin Lucifer, "light-bearer"), the Vulgate's translation of helel ben-shachar ("Day Star, son of Dawn") in Isaiah 14.12. See the "Lucifer question" section below, the identification of Lucifer with Satan is the dominant Christian tradition but is exegetically contested.

Title and function names:

The serpent / the serpent of old, Genesis 3; Revelation 12.9 explicitly identifies the Eden serpent with "that ancient serpent, who is called the devil and Satan."
The dragon / great red dragon, Rev 12:3-17; 13:2-4; 20:2. Apocalyptic-symbolic form.
The tempter (ho peirazōn), Matt 4:3; 1 Thess 3:5.
The accuser of our brothers (ho katēgōr tōn adelphōn), Rev 12:10.
The evil one (ho ponēros), Matt 6:13 (the Lord's Prayer); Matt 13:19, 38; John 17:15; Eph 6:16; 1 John 2:13-14, 3:12, 5:18-19.
Father of lies (patēr tou pseudous), John 8:44.
A murderer from the beginning, John 8:44.
The prince of this world / ruler of this world (ho archōn tou kosmou toutou), John 12:31; 14:30; 16:11.
The god of this world / this age (ho theos tou aiōnos toutou), 2 Cor 4:4.
The prince of the power of the air (ho archōn tēs exousias tou aeros), Eph 2:2.
The prince of demons (ho archōn tōn daimoniōn), Matt 9:34, 12:24; Mark 3:22; Luke 11:15.
The adversary (antidikos), 1 Peter 5.8, "your adversary the devil prowls around like a roaring lion seeking someone to devour."
A roaring lion, same verse; image of predation.
An angel of light (in disguise), 2 Corinthians 11.14, "Satan disguises himself as an angel of light."

This many names is itself doctrinally significant. Scripture saturates the language because the figure operates by many strategies, tempter, accuser, deceiver, devourer, slanderer, ruler, and no single word captures him.

What is the devil?, being, not metaphor; creature, not deity

A standing modern question: is the devil a real personal being, a metaphor for evil, an ancient mythological holdover, or an impersonal cosmic force?

The Christian answer, across two millennia of orthodox tradition, is precise:

A real personal being with intellect and will. Not a metaphor for evil-in-general. The wilderness temptation (Matt 4:1-11) is reported as dialogue between two persons with specific propositions; Job 1-2 records God speaking with him; Rev 12 names him with the article ("the dragon"). The personhood is consistent.
A created angelic being, originally good. "Every creature of God is good" (1 Tim 4:4). The devil was created as an angel; his evil is derived from a free-creature fall, not from his nature as created. The early church fathers were unanimous on this against gnostic and Manichaean dualism.
A finite creature, not God's coeternal opposite. The devil is not the "dark equal" of God. Christianity is not dualism. The devil exists by God's allowance, operates under God's permission (Job 1:12, "Behold, all that he has is in your power"), and will be judged by God's authority (Rev 20:10).
An angel, specifically, not a different order of being. "The devil and his angels" (Matt 25:41) suggests he is of the angelic order, a fallen one, but ontologically an angel. Jude 6 confirms: "the angels who did not stay within their own position of authority, but left their proper dwelling."

What he is not:

Not a metaphor for evil. The demythologizing reading (Bultmann; much liberal Protestantism) treats Satan as personified evil. The texts resist this, the Gospels report encounter, not literary device.
Not God's equal. Cosmic dualism (Zoroastrian, Manichaean, gnostic) is condemned by orthodox Christianity. The devil is creature, finite, derivative.
Not an impersonal force. New Age and theosophical readings reduce Satan to a principle. The biblical picture is personal, dialogue, accusation, strategy, intent.
Not omnipresent or omniscient. He is one being; he must move (1 Peter 5.8, "walks about"); he learns by observation; his agents are how he extends his reach.

So the answer to "what is he": a fallen archangel, a created spiritual person, an angel by original kind, evil by free choice, finite by nature, defeated at the cross, doomed by Scripture's clear word, and dangerous in the meantime to those who don't take him seriously.

Origin, the fall of the devil

Scripture is reticent on the when and how of the devil's fall. Four passages have carried the doctrinal weight historically:

Isaiah 14.12-15, "How you have fallen from heaven, O Day Star, son of Dawn!…you said in your heart, 'I will ascend to heaven; above the stars of God I will set my throne on high.'" The immediate referent is the king of Babylon; the patristic and medieval reading sees a cosmic-fall referent behind the political polemic.
Ezekiel 28.11-17, "you were the signet of perfection, full of wisdom and perfect in beauty…you were in Eden, the garden of God…you were an anointed guardian cherub…till unrighteousness was found in you." The immediate referent is the king of Tyre; same dual-reference pattern as Isaiah 14.
Jude 6, "the angels who did not stay within their own position of authority, but left their proper dwelling, He has kept in eternal chains under gloomy darkness until the judgment of the great day."
2 Pet 2:4, "God did not spare angels when they sinned, but cast them into hell and committed them to chains of gloomy darkness to be kept until the judgment."
Luke 10:18, "I saw Satan fall like lightning from heaven." Jesus' own report.
Revelation 12.9, "the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world, he was thrown down to the earth, and his angels were thrown down with him."

The composite picture: a high-ranking angel rebelled against God by pride (1 Tim 3:6, "the condemnation of the devil"), drew a portion of the angelic host with him, was cast down from heavenly position, and now operates as the prince of the rebel angels until final judgment.

Two questions Scripture leaves open:

When did the fall happen? Before the creation of humanity (the devil is already evil and active in Eden, Gen 3)? Concurrent with creation? After? The biblical picture is before Genesis 3 but Scripture doesn't fix the timing precisely.
What was the specific sin? Pride (1 Tim 3:6 implies it). The Isaiah 14 / Ezek 28 readings flesh it out as the self-exaltation of "I will be like the Most High." Some traditions add a refusal to bow to humanity (Islamic and some apocryphal Jewish readings).

The Lucifer question, three readings

The identification of Lucifer with Satan is the dominant Christian tradition. It rests on the Latin Vulgate's translation of Isaiah 14.12's helel ben-shachar ("Day Star, son of Dawn") as Lucifer, and the church's reading of the passage as having a cosmic referent behind the king-of-Babylon taunt. The result is the picture most Christians hold: Satan was originally Lucifer ("light-bearer"), a high angel of beauty and rank who fell by pride.

But the identification is exegetically contested. Three readings circulate.

Reading 1, Traditional: Lucifer = Satan (the dominant Christian tradition)

The patristic, medieval, and Reformation reading. Isaiah 14:12-15 and Ezek 28:11-17, while addressed to the kings of Babylon and Tyre respectively, have a dual referent: the cosmic spiritual ruler behind them whose pride and fall they typify. The Latin Lucifer names this cosmic figure, Satan before his fall. Origen, Tertullian, Jerome, Augustine, and most medieval theologians read it this way. Most contemporary conservative evangelicals continue this reading.

Reading 2, Critical: Lucifer is only a poetic figure for the king of Babylon

The dominant modern critical reading. The text is straightforwardly about the king of Babylon (Isa 14:4, "this taunt against the king of Babylon"); the "Day Star" is an astronomical / mythological image (Venus as the morning star, fallen at dawn); no cosmic-spiritual referent exists in the original meaning. "Lucifer" as a personal name for Satan is a later Christian reading-back. The same goes for Ezek 28, the cherub-imagery is a poetic way of describing the king of Tyre's grandeur, not literal angelology.

On this reading, Lucifer is not a being at all, it is a Latin translation of a Hebrew poetic figure for an ANE king. Satan exists (NT material is sufficient); the name "Lucifer" applied to him does not. This reading is held by most modern critical scholars and by some careful evangelical exegetes (e.g., John Walton).

Reading 3, Lucifer is one of Satan's angels (a minority theory worth noting)

A third reading, less common but theologically interesting: Satan and Lucifer are distinct beings, Lucifer being a different fallen angel, one of Satan's high-ranking subordinates rather than Satan himself.

The reasoning behind this view:

Isaiah 14:12-15 names "Day Star, son of Dawn", language not used elsewhere for Satan. The NT names for Satan (dragon, serpent, devil, accuser) never include "Day Star" or "Lucifer." If these were the same being, the strongest expected place to repeat the name would be Rev 12's identification of "the great dragon", yet Rev 12 names him "the ancient serpent, who is called the devil and Satan," with no mention of Lucifer or Day Star.
The Isaiah 14 figure's specific sin is "I will ascend…I will set my throne above the stars of God." This is the language of a subordinate angel attempting to elevate above other angels and ultimately above God, a being aspiring to be the Most High. Satan in the NT is depicted not as one aspiring to ascend but as one who already operates with significant authority (prince of this world, god of this age, prince of the power of the air). The trajectories may not match cleanly.
The cherub-imagery in Ezek 28 points to a guardian-cherub office (cf. Gen 3:24; Ex 25:18-22), a specific cherubic role. Satan is not always identified as a cherub in tradition; many readings treat him as a higher rank.
Different fallen angels are visible in Scripture as distinct beings. Apollyon-Abaddon (Rev 9:11), the "prince of Persia" and "prince of Greece" (Dan 10:13, 20), Beelzebul-as-name-distinct-from-Satan (debated), and the named-spirit traditions all suggest hierarchy with distinct named beings under the devil's command.
Some Second Temple Jewish texts (1 Enoch, the Book of the Watchers) describe multiple high fallen angels with distinct names, ranks, and fates, Shemyaza, Azazel, Satanail, and others as separate from "Satan" the chief. This is not canonical Scripture but it reflects a Jewish exegetical tradition that read the spiritual hierarchy as populated, not unitary.

On this reading: Lucifer was a high angel, perhaps the highest under Satan, perhaps a being so significant his fall is described in Isaiah 14, who fell in his own pride and now serves as one of Satan's generals. He is not Satan himself but one of Satan's chief subordinates. The Latin tradition's collapse of the two names into one being is a later conflation.

The codex notes this reading without endorsing it as the dominant view. The traditional Reading 1 remains the church's mainstream. Reading 2 is the rigorous-critical answer. Reading 3 is a serious minority theological reflection worth considering for the believer who notices that the NT never calls Satan "Lucifer" or "Day Star."

The honest summary: Scripture does not name Satan's pre-fall name. The traditional reading assumes it was Lucifer; the critical reading denies that Lucifer was ever a being; the minority reading distinguishes Lucifer from Satan as separate fallen angels. The Christian who insists Scripture demands the traditional identification has overstated the evidence; the Christian who forbids the traditional identification has overstated against the long patristic and medieval reading. Hold it as tradition with serious exegetical contest.

The devil's mission and goal

Scripture is clear on what the devil is trying to do.

Oppose God by every means available. His standing posture is rebellion against God's rule (Job 1; Zech 3:1; Rev 12). He cannot defeat God; he can resist, delay, and damage.
Steal, kill, and destroy. John 10:10, "the thief comes only to steal and kill and destroy", applied to the devil through Jesus' contrast with the Good Shepherd.
Deceive the nations. Revelation 12.9, "the deceiver of the whole world"; Rev 20:3, Satan bound "so that he might not deceive the nations any longer." Deception is the mode of his rule.
Take captives by his will. 2 Tim 2:26, "they may come to their senses and escape from the snare of the devil, after being captured by him to do his will."
Tempt believers to sin. 1 Cor 7:5; 1 Thess 3:5.
Accuse believers before God. Rev 12:10, "the accuser of our brothers…day and night." Zech 3:1, accusing Joshua the high priest.
Hinder gospel proclamation. 1 Thess 2:18, Paul: "we wanted to come to you…but Satan hindered us."
Sow false believers into the church. Matt 13:38-39, the weeds among the wheat are sown by the devil.
Blind the minds of unbelievers. 2 Cor 4:4, "the god of this world has blinded the minds of unbelievers, to keep them from seeing the light of the gospel of the glory of Christ."
Devour those who do not resist. 1 Peter 5.8, "your adversary the devil prowls around like a roaring lion, seeking someone to devour."

The unifying goal is the destruction of human beings made in God's image, by every available means, deception, accusation, temptation, oppression, possession, persecution, to deny God the worshipers and image-bearers Creation purposes for Him. His war is against God, but his combat is most often against humans, because we are the image-bearers in dispute.

Interactions with humans, the major narrative cases

Eden, Eve and Adam (Genesis 3). The serpent (identified with Satan in Revelation 12.9) tempts Eve through a strategy of doubt ("did God really say…?"), denial ("you will not surely die"), and distortion ("you will be like God"). The first sin enters human history through Satan's temptation.
Job, the prosecutor in the divine council (Job 1.6-8, Job 2). Satan appears among the "sons of God" and challenges God's evaluation of Job. God grants permission (1:12; 2:6) for Satan to test Job within set limits. Reveals: Satan operates under God's permission, not his own authority; he is the adversary of God's people whose accusations God hears but does not credit.
The census, David (1 Chr 21:1). Satan moves David to number Israel. Compared with 2 Sam 24:1, which credits the same action to the LORD's anger. The synthesis: God permits Satan to do what advances God's own purposes of discipline; Satan's malice and God's sovereignty coexist.
Zechariah's vision, Joshua the high priest (Zech 3:1). Satan stands at Joshua's right hand to accuse him; the angel of the LORD rebukes Satan and changes Joshua's filthy garments. Reveals the courtroom imagery of Satan's accuser-role and God's overruling of his charges.
Saul, torment (1 Sam 16:14; 18:10; 19:9). "An evil spirit from the LORD" torments Saul; David's harp brings relief. Reveals demonic affliction can come under God's permission.
Ananias and Sapphira (Acts 5:3). "Satan filled your heart to lie to the Holy Spirit." Reveals Satan's direct work in believers' deceitful choices.
Paul's thorn (2 Cor 12:7). "A messenger of Satan to harass me." Reveals demonic affliction permitted for the believer's good.
Peter, sifting and denial (Luke 22:31). "Satan demanded to have you, that he might sift you like wheat, but I have prayed for you that your faith may not fail." Reveals the petitionary structure (Satan must ask; Jesus intercedes) and the strategy of attacking through faith-failure.
Judas (Luke 22:3; John 13:27). "Satan entered into him." The most extreme reported case of demonic indwelling of a follower-turned-traitor.
The demoniacs of the Gospels (Mark 1, Mark 5, Mark 9, Matt 8:28-34, Matt 15:21-28, Luke 13:11). Direct demonic encounter; spirits subordinate to Satan; cast out by Jesus' command. See Demons for the detail.
The acts of the apostles, Paul's slave girl (Authority to Cast Out Demons's encounter-mode section), the sons of Sceva, Bar-Jesus, the early church's continual encounter with Satan's strategies.

The pattern: Satan attacks at the weak point, doubt (Eve), integrity (Job), pride (David's census), worship (Saul), money (Ananias and Sapphira), faith (Peter), discipleship-failure (Judas), the body (paul's thorn, the demoniacs). His strategy varies; his goal is constant.

Interactions with Jesus

Christ's encounters with the devil are theologically load-bearing.

The wilderness temptation (Matt 4:1-11; Mark 1:12-13; Luke 4:1-13)

The fullest reported direct dialogue between Satan and Jesus. Three temptations:

Bread from stones, appeal to bodily appetite; "if you are the Son of God, command…", testing identity through provision-bypass.
The pinnacle of the temple, appeal to spectacle; misquoted Scripture (Ps 91:11-12 truncated). Testing identity through self-display.
The kingdoms of the world, appeal to power; "all these I will give you, if you will fall down and worship me." Testing identity through messianic-shortcut bypassing the cross.

Jesus answers each with Scripture (Deut 8:3; Deut 6:16; Deut 6:13). The pattern teaches:

Scripture is the believer's primary weapon (cf. Eph 6:17, "the sword of the Spirit, which is the word of God")
Satan quotes Scripture; he can be answered only by Scripture rightly handled
Satan attempts to push toward a goal apart from the way of the cross
The encounter ends with Satan departing "until an opportune time" (Luke 4:13), the conflict resumes

"Satan, get behind me", through Peter (Matt 16:23; Mark 8:33)

When Peter rebukes Jesus for predicting His death, Jesus responds: "Get behind me, Satan! You are a hindrance to me. For you are not setting your mind on the things of God, but on the things of man." This reveals that Satan can speak through close disciples to push the believer away from the cross-shaped will of God, and that the right response is direct rebuke.

"Now is the judgment of this world" (John 12:31)

On the eve of the cross: "now is the judgment of this world; now will the ruler of this world be cast out." The cross is judicial, Satan's authority is judicially broken there.

"The ruler of this world is coming. He has no claim on me" (John 14:30)

In the upper room: Satan is coming through Judas; he has no rightful claim against the sinless Christ.

Gethsemane and the cross

Luke 22:53, "this is your hour, and the authority of darkness." The arrest and crucifixion are Satan's permitted hour; the cross is where Satan's permitted hour becomes the means of his defeat. Colossians 2.15, "He disarmed the rulers and authorities and put them to open shame, triumphing over them in Him." Heb 2:14, "that through death He might destroy the one who has the power of death, that is, the devil."

Post-resurrection

The resurrected Christ holds "the keys of Death and Hades" (Rev 1:18). Satan's power over death, his most-feared weapon, is broken at the empty tomb.

The five generals of hell

Within charismatic-deliverance teaching (especially in the streams of Win Worley, Frank Hammond, John Eckhardt, Bill Hamon, and the broader Pentecostal deliverance literature), Satan is often described as commanding a tiered hierarchy of subordinate princes. The popular framework is the five generals or five strongmen, five chief principalities the deliverance literature identifies as the major patterns of demonic operation in human life and culture.

Different teachers name slightly different five; the most-cited list:

Jezebel, control, manipulation, false spiritual authority, intimidation, sexual immorality used as power. Anchored in Revelation 2.20 (the woman Jezebel who calls herself a prophet); the OT figure (1 Kings 16:31; 2 Kings 9). The Jezebel pattern operates wherever spiritual authority is hijacked through manipulation and seduction. See Spirit of Jezebel.
Leviathan, pride, twisting of communication, hardness of heart, breaking of relationships through misunderstanding. Anchored in Job 41; Isaiah 27.1; Ps 74:14; Ps 104:26. The "twisting serpent" who corrupts speech and produces offense. See Spirit of Leviathan.
Python, divination, occult bondage, constriction of prayer and discernment, false spiritual gifting. Anchored in Acts 16:16-18 (the slave girl with a pythōn spirit). Python kills by squeezing, its work is the suffocation of spiritual life. See Spirit of Python.
Beelzebub (or Beelzebul), lord of demons, idolatry, witchcraft, the chief over the unclean spirits in many deliverance taxonomies. Anchored in Matt 12:24-27 and the broader name. Some deliverance teachers treat Beelzebub as Satan himself; most treat him as a chief subordinate.
Mammon, wealth-worship, greed, financial bondage, trust in money over God. Anchored in Matt 6:24, "you cannot serve God and Mammon." Mammon personifies the spiritual force behind the love of money (1 Tim 6:10). See Spirit of Mammon.

Other names sometimes named among the five (different teachers vary): Belial (lawlessness, worthlessness, 2 Cor 6:15), Apollyon / Abaddon (destruction, Rev 9:11), Antichrist (opposition to Christ, 1 John 2:18), Death (Rev 6:8).

Status of the framework. The "five generals" model is not a direct biblical schema; no NT passage lists five chief principalities under Satan. It is a pastoral synthesis from the deliverance-ministry tradition, drawing on real biblical material to organize patterns of demonic operation that recur. Treat it as a diagnostic framework (like the Spiritual Warfare hub's seven gateways and forty named spirits), useful for naming patterns, not a doctrinally-fixed angelology.

The exegetically-strongest cases for distinct named principalities are Jezebel (Rev 2:20 names a specifically demonic-spiritual operation under that name), Python (Acts 16's spirit of pythōn is explicitly a distinct spirit), and Beelzebub (Matt 12 identifies him as the prince of demons). Leviathan and Mammon are personifications strongly grounded in Scripture but less directly identified as named angelic-rank rulers.

Church-father commentary and hermeneutics

The early church engaged the devil extensively. A representative sweep:

Justin Martyr (c. 100-165), First Apology 28: demons are fallen angels who sinned by union with mortal women (Gen 6:1-4); the devil is their chief; idolatry is demonic worship. Justin's reading set the Second Temple Watchers tradition as the patristic default for early centuries.
Irenaeus (c. 130-202), Against Heresies: Satan was created good and fell by free choice; his work is reversed by the cross; the patristic doctrine of recapitulation (Christ recapitulates Adam's history and conquers where Adam fell) frames Satan's defeat as the undoing of Eden. Against Heresies 5.21-23 on the devil's defeat by Christ.
Tertullian (c. 155-220), De Patientia; De Spectaculis; Apology: Satan is the great instigator of impatience, anger, and pagan spectacle. Tertullian's polemical edge sharpens the devil's role in cultural opposition.
Origen (c. 184-253), On First Principles; Against Celsus: rich and contested treatment. Origen affirms Satan as a real being but speculates (controversially) on the possible final restoration of the devil, a view his church later condemned. His reading of Isaiah 14 and Ezek 28 as cosmic-fall passages cemented that tradition in the East.
Athanasius (c. 296-373), On the Incarnation: the devil holds power over death until Christ; the incarnation is for the death of Christ; at the cross "death is brought to nothing." Satan's defeat is christologically central.
Augustine (354-430), City of God; Confessions; De Trinitate. The devil is the founder of the civitas terrena, the earthly city ruled by love of self to the contempt of God. City of God 11-12 treats the angelic fall in depth. Augustine rejects Origen's speculative universalism for the devil and fixes the doctrine of eternal punishment for him. Augustine also articulates the non posse non peccare (unable not to sin) of the fallen angels, their will is fixed in evil.
John Chrysostom (c. 347-407), homilies emphasize the devil's strategies (subtlety, opportunism, timing) and the means of resistance (Scripture, prayer, fasting, watchfulness). Practical, pastoral.
John of Damascus (c. 675-749), Exact Exposition of the Orthodox Faith 2.4: "He was the first to depart from good and become evil. For good is the natural disposition of God's creatures, but evil is a deflection from good." The Eastern dogmatic standard.
Gregory the Great (c. 540-604), Moralia in Job: a vast allegorical and pastoral reading of Job that treats Satan as the type of every accuser, every tempter, every adversary the believer meets.
Anselm (1033-1109), Cur Deus Homo: rejects the patristic "ransom to Satan" theory of atonement (the view that the cross was a payment made to the devil) in favor of satisfaction (the cross satisfies God's honor and justice). Anselm's move reshaped Western soteriology and the role of Satan in atonement.
Aquinas (1225-1274), Summa Theologica 1.63-64; Summa Contra Gentiles 3.108-110: scholastic precision on the angelic fall. The fall was by the first act of will of the fallen angels, an immediate, irrevocable choice. The choice was for self-rule rather than dependence on God. Aquinas rejects the idea of a long internal struggle; the angelic intellect saw clearly and chose evil all at once.

Patristic hermeneutic patterns:

Dual-referent reading of Isa 14 and Ezek 28, the proximate referent is the king (Babylon, Tyre); the deeper referent is Satan. This is the patristic default and the medieval standard.
Genesis 3 serpent = Satan. Confirmed by Revelation 12.9; the patristic and medieval reading is unanimous.
Job 1-2 satan = the devil. Sometimes debated in modern critical scholarship (which reads OT śāṭān as a generic "prosecutor" before later development), but the patristic and traditional reading takes it as the devil himself.
The Gen 6 sons-of-God read by Justin, Tertullian, Cyprian, and many fathers as fallen angels (the Watchers tradition); by Augustine and later Western tradition as the line of Seth mingling with the line of Cain. Modern conservative scholarship is divided; Heiser and the "divine council" tradition revive the Watchers reading.
The believer reads Scripture knowing Satan reads it too (Matt 4, the wilderness temptation features Satan quoting Ps 91). The patristic instinct is to read Scripture in the rule of faith, never in isolation, never against itself.

Eschatology, the end of the devil

Scripture is decisive on the devil's final state.

Already defeated in principle at the cross, Colossians 2.15: Christ disarmed the rulers and authorities at the cross. Heb 2:14, through death Christ destroyed the one who had the power of death. The devil's authority is judicially broken; his ongoing operation is on borrowed time.
Cast down from heavenly place, Revelation 12.9: "the great dragon was thrown down…and his angels were thrown down with him." Some readings place this at the cross / ascension; some at the Parousia. Either way, his cosmic position is forfeit.
Bound during a thousand-year period, Rev 20:1-3. "An angel coming down from heaven, having the key of the bottomless pit and a great chain in his hand. And he seized the dragon, that ancient serpent, who is the devil and Satan, and bound him for a thousand years…that he might not deceive the nations any longer." Readings:
Premillennial, a future literal thousand-year reign of Christ during which Satan is bound; he is released briefly at the end before final judgment.
Amillennial, the thousand years is the present church age between the first and second comings; Satan is bound in the sense that he cannot prevent the gospel reaching the nations; he is released for a brief final-deception period before the Parousia.
Postmillennial, a future period of widespread Christian dominance, with Satan progressively bound through the spread of the gospel, then briefly released.
Released briefly to deceive the nations, Rev 20:7-10. Satan released after the thousand years; gathers Gog and Magog to attack the camp of the saints; consumed by fire from heaven.
Cast into the lake of fire forever, Revelation 20.10: "and the devil who had deceived them was thrown into the lake of fire and sulfur where the beast and the false prophet were, and they will be tormented day and night forever and ever." The final judgment. Eternal punishment, not annihilation, in the dominant traditional reading.
Eternal fire prepared for the devil and his angels, Matt 25:41, Jesus' own words. The eternal fire is prepared for the devil; humans go there only if they share his rebellion.

The eschatological certainty: the devil loses. The cross has already secured it; the consummation will reveal it. The Christian's posture is not anxious but confident, vigilance (1 Peter 5.8) with assured outcome (Revelation 20.10).

The believer's posture toward the devil

Five postures Scripture commends together:

Vigilance, not fear. 1 Peter 5.8, be sober, be watchful. The lion is real; he is not the lord.
Resistance through submission to God. James 4.7, "submit yourselves therefore to God; resist the devil, and he will flee from you." Submission first, then resistance.
Armor. Ephesians 6.10-18, the full panoply: truth, righteousness, gospel readiness, faith, salvation, Spirit's sword, prayer.
No place given. Eph 4:27, "give no opportunity to the devil." Unrepented sin gives him ground; daily repentance closes it.
Confidence in victory. Rom 16:20, "the God of peace will soon crush Satan under your feet." The outcome is settled.