# G4893 - syneidesis **Strong's:** [G4893](https://www.blueletterbible.org/lexicon/g4893/) · BLB lookup **Pronunciation:** soon-i'-day-sis **Part of speech:** feminine noun **Root:** *sun-* (with / together) + *eidēsis* (knowing), literally "co-knowledge" / "knowledge-with-oneself" **NT occurrences:** 30 ## Semantic range (Thayer / BDAG) 1. **The conscience**, the inner moral faculty by which one knows oneself morally 2. **Moral consciousness / awareness**, knowing-with-oneself about right and wrong 3. **Self-judgment / inner witness**, the faculty that accuses or excuses The Latin *conscientia* (translating *syneidēsis*) preserves the same etymology, *con-* + *scire* = "knowing-with." ## Theological force Conscience is the **internal moral faculty** by which the person stands in self-judgment. The NT pattern: ### Universal conscience (anthropological foundation) - **[Romans 2.14-15](/codex/romans-2-14-15/)**, Gentiles, "not having the Law… show the work of the Law written in their hearts, *syneidēseōs* bearing witness, their thoughts alternately accusing or else defending them" This is the foundational text. Universal moral knowledge is grounded in the *syneidēsis*, built into every human as part of the *imago Dei*. ### Spectrum of conscience-states Scripture distinguishes various states of conscience: - **Good conscience**, [Acts 23:1](/codex/acts-23-1/); [1 Tim 1:5](/codex/1-timothy-1-5/), [19](/codex/1-timothy-1-19/); 3:9; [2 Tim 1:3](/codex/2-timothy-1-3/); [Heb 13:18](/codex/hebrews-13-18/); [1 Pet 3:16](/codex/1-peter-3-16/), [21](/codex/1-peter-3-21/) - **Clean conscience**, [1 Tim 3:9](/codex/1-timothy-3-9/); [2 Tim 1:3](/codex/2-timothy-1-3/) - **Pure conscience**, [2 Tim 1:3](/codex/2-timothy-1-3/) - **Weak conscience**, [1 Cor 8:7-12](/codex/1-corinthians-8-7-12/) (the over-scrupulous) - **Defiled conscience**, [1 Cor 8:7](/codex/1-corinthians-8-7/); [Titus 1:15](/codex/titus-1-15/) - **Seared conscience**, [1 Tim 4:2](/codex/1-timothy-4-2/) (*kekautēriasmenōn*, "branded as with a hot iron"; the conscience that has lost sensitivity through persistent rebellion) - **Evil conscience**, [Heb 10:22](/codex/hebrews-10-22/) The conscience is **universal** but **educable**, it can be informed, refined, hardened, or seared. It is a *moral compass* but not infallible, it requires Scripture-formation to be reliable. ### Christ purifies the conscience - **[Hebrews 9:14](/codex/hebrews-9-14/)**, Christ's blood "cleanse[s] your *syneidēsin* from dead works to serve the living God" - **[Hebrews 10:22](/codex/hebrews-10-22/)**, drawing near with hearts sprinkled clean from an evil *syneidēseōs* - **[1 Peter 3:21](/codex/1-peter-3-21/)**, baptism "an appeal to God for a good *syneidēseōs*" The atonement *purifies* the conscience, addressing not just legal guilt but inner moral consciousness. ## Pauline conscience-ethics Paul develops conscience extensively in [1 Corinthians 8](/codex/1-corinthians-8/)-10 (the food-offered-to-idols question): - The strong's conscience permits eating; the weak's conscience condemns it - Each must act according to *their own* conscience - The strong must defer to the weak, never violate the brother's conscience The pattern: conscience is *binding*. Even an *erring* conscience binds, to act against one's conscience is to sin ([Rom 14:23](/codex/romans-14-23/), "whatever is not from faith is sin"). ## Conscience and natural law The conscience grounds the **natural law tradition** (Aquinas's *lex naturalis*; Reformed scholastic engagement). [Romans 2:14-15](/codex/romans-2-14-15/) + the *imago Dei* ([Gen 1:27](/codex/genesis-1-27/)) → universal moral knowledge → universal moral accountability → universal need of the gospel. Modern engagement: C. S. Lewis (*The Abolition of Man*, 1943), the cross-cultural "Tao"; Edward Feser (*The Last Superstition*, 2008), natural-law tradition; Robert George (*Conscience and Its Enemies*, 2013). ## Notable verses - **[Romans 2.14-15](/codex/romans-2-14-15/)**, universal conscience - **[Romans 9:1](/codex/romans-9-1/)**, Paul's conscience confirming truthfulness in the Holy Spirit - **[Romans 13:5](/codex/romans-13-5/)**, "be in subjection… for *syneidēsin's* sake" - **[1 Corinthians 8:7-12](/codex/1-corinthians-8-7-12/); 10:25-29**, weak / strong conscience and food - **[2 Corinthians 1:12](/codex/2-corinthians-1-12/)**, Paul's "good *syneidēsis*" as testimony - **[2 Corinthians 4:2](/codex/2-corinthians-4-2/)**, "by the manifestation of the truth commending ourselves to every *syneidēsei* of men" - **[1 Timothy 1:5](/codex/1-timothy-1-5/), [19](/codex/1-timothy-1-19/)**, good *syneidēsis* paired with sincere faith - **[1 Timothy 4:2](/codex/1-timothy-4-2/)**, seared *syneidēsis* - **[Hebrews 9:14](/codex/hebrews-9-14/); 10:22**, *syneidēsis* purified by Christ ## Patristic / scholarly note The conscience-language is foundational to Christian moral theology: - Augustine, extensive engagement (*Confessions*; *On Christian Doctrine*) - Aquinas (*Summa* I, q. 79, a. 12-13), *synderesis* (the underlying habit / capacity) vs *conscientia* (its application) - Reformation: Luther (*The Freedom of a Christian*); Calvin (*Institutes* III.19; IV.10) - Modern: Robert George (*Conscience and Its Enemies*, 2013); J. Budziszewski (*What We Can't Not Know*, 2003); J. Daryl Charles (*Retrieving the Natural Law*, 2008) ## See also - [G3551 - nomos](/codex/g3551-nomos/), law - [G2588 - kardia](/codex/g2588-kardia/), heart - [G3563 - nous](/codex/g3563-nous/), mind - [Romans 2.14-15](/codex/romans-2-14-15/), primary anchor passage - [Atheism Moral Neutrality Failure](/codex/atheism-moral-neutrality-failure/), apologetic syllogism - [Moral Argument](/codex/moral-arguments/), apologetic syllogism ## Notes _Lexical workspace for syneidēsis._