Lexicon

G5287 - hypostasis

Strong's: G5287 · BLB lookup Pronunciation: hoop-os'-tas-is Part of speech: feminine noun Root: hypo- (under / beneath) + stasis (a standing), literally "that which stands under" / "underlying reality" NT occurrences: 5 (2 Corinthians 9:4; 11:17; Hebrews 1:3; 3:14; 11:1)

Semantic range (Thayer / BDAG / TDNT)

The substance / underlying reality of something, what makes it really be
Confidence / assurance / firm trust, having a "firm standing" emotionally / volitionally
Essence / nature (in patristic and Trinitarian usage: person, see below)
Substantive thing / undertaking, that which gives reality / objective grounding

The semantic range spans:

Metaphysical (substance / essence)
Psychological (assurance / confidence)
Volitional (resolution / undertaking)

NT uses

Hebrews 1:3, charaktēr tēs hypostaseōs autou

"He is the radiance of His glory and the exact representation (charaktēr) of His nature (hypostaseōs)." (Hebrews 1:3, NASB95)

The Father's hypostasis (essential nature / substance) is exactly represented (charaktēr) by the Son. The Christological force: the Son perfectly displays the Father's essential being. Combined with Colossians 1.15 (image of the invisible God) and John 1.18 (the Son who has explained the Father), Hebrews 1:3 is one of the strongest NT statements of the Son's full deity.

Hebrews 11:1, pistis estin elpizomenōn hypostasis

"Now faith is the assurance (hypostasis) of things hoped for, the conviction of things not seen." (Hebrews 11:1, NASB95)

Hypostasis here is the substantial / objective grounding of hope, what gives hope its real-standing. Faith is not wishful thinking; it has hypostasis, substantive grounding in God's reality.

Hebrews 3:14, hypostaseōs held firm

"For we have become partakers of Christ, if we hold fast the beginning of our assurance (hypostaseōs) firm until the end." (Hebrews 3:14, NASB95)

Hypostasis here = the believer's firm standing / confidence in Christ, to be maintained.

2 Corinthians 9:4; 11:17

In these contexts, hypostasis approaches "confidence" / "boasting", the firmness of Paul's claims.

The Trinitarian-doctrinal use of hypostasis

The most theologically significant use of hypostasis is patristic / Trinitarian, beyond NT-direct usage. The Cappadocian Fathers (Basil of Caesarea, Gregory of Nazianzus, Gregory of Nyssa, c. AD 360-380) crystallized the Trinitarian formula:

One ousia (essence / substance), three hypostaseis (persons / individual subsistences).

ousia = the what, the divine essence / nature
hypostasis = the who, the distinct personal subsistence (Father / Son / Spirit)

This usage develops the NT semantic range: the Father, Son, and Spirit are each fully divine (homoousios, same essence) but distinct as persons (treis hypostaseis, three persons / individual subsistences).

Earlier Latin / Greek confusion: hypostasis in earlier patristic Greek often meant "essence / substance", close to ousia. The Latin equivalent substantia (literally translating hypostasis) created confusion when Western theologians said "one substance" and Eastern theologians distinguished one ousia / three hypostaseis. The Cappadocians clarified: hypostasis = "person" (technical sense), ousia = "essence." This terminological clarification was crucial for the Trinitarian dogma.

Hypostasis and the hypostatic union

The doctrine of the hypostatic union, that Christ is one person (hypostasis) in two natures (divine + human), uses this same vocabulary. The Council of Chalcedon (AD 451) formulated:

"We confess one and the same our Lord Jesus Christ, the same perfect in Godhead, the same perfect in manhood, truly God and truly man… acknowledged in two natures, without confusion, without change, without division, without separation; the distinction of natures being in no way destroyed by the union, but rather the property of each nature being preserved, and concurring in one person and one hypostasis…"

One hypostasis = the personal Subject (the Son of God). Two natures = divine + human. The hypostasis (person) of the eternal Son is the locus of the union.

Christological force

Hebrews 1:3's charaktēr tēs hypostaseōs autou combined with Trinitarian-patristic development establishes:

The Son shares the Father's essential being (homoousios)
The Son is a distinct person (hypostasis) from the Father
In the incarnation, the divine hypostasis of the Son united to a human nature
Christ is therefore one person (the eternal Son) in two natures (divine + human)

Notable verses outside NT but in patristic use

The Trinitarian / Christological use is patristic-developmental, beyond direct NT usage:

Athanasius, Basil, Gregory of Nazianzus, Cyril of Alexandria, extensive
Council of Nicaea (AD 325), homoousios established
Council of Constantinople (AD 381), Cappadocian formula canonized
Council of Ephesus (AD 431), theotokos, against Nestorius
Council of Chalcedon (AD 451), hypostatic union formula

Patristic / scholarly note

The technical-Trinitarian use of hypostasis is one of the most-studied patristic-philological developments. Modern conservative engagement: J. N. D. Kelly (Early Christian Doctrines, 1958/2003); Robert Letham (The Holy Trinity, 2004); Khaled Anatolios (Retrieving Nicaea, 2011); John Behr (The Way to Nicaea, 2001; The Nicene Faith, 2004).

Notes

Lexical workspace for hypostasis.