804. asphalés
Lexical Summary
asphalés: Safe, secure, certain, reliable

Original Word: ἀσφαλής
Part of Speech: Adjective
Transliteration: asphalés
Pronunciation: as-fah-LACE
Phonetic Spelling: (as-fal-ace')
KJV: certain(-ty), safe, sure
NASB: certain, definite, facts, safeguard, sure
Word Origin: [from G1 (α - Alpha) (as a negative particle) and sphallo "to fail"]

1. unfailing
2. secure
{literally or figuratively}

Strong's Exhaustive Concordance
certain, safe, sure.

From a (as a negative particle) and sphallo (to "fail"); secure (literally or figuratively) -- certain(-ty), safe, sure.

see GREEK a

HELPS Word-studies

804 asphalḗs (from 1 /A "not" and sphallō, "totter, cast down") – properly, secure because on solid footing, i.e. built on what does not totter (fall, slip); hence, "unfailing, safe, reliable, trustworthy" (Souter).

NAS Exhaustive Concordance
Word Origin
from alpha (as a neg. prefix) and sphalló (to trip up)
Definition
certain, secure
NASB Translation
certain (1), definite (1), facts (1), safeguard (1), sure (1).

Thayer's Greek Lexicon
STRONGS NT 804: ἀσφαλής

ἀσφαλής, ἀσφαλές (σφάλλω to make to totter or fall, to cheat (cf. Latinfallo, German fallen, etc., English fall, fail), σφάλλομαι to fall, to reel) (from Homer down);

a. firm (that can be relied on, confided in): ἄγκυρα, Hebrews 6:19 (where I, and Tr have received as the form of accusative singular ἀσφαλην (Tdf.7ἀσφαλην; cf. Tdf. at the passage; Delitzsch, commentary at the passage) see ἄρσην). Tropically, certain, true: Acts 25:26; τό ἀσφαλές, Acts 21:34; Acts 22:30.

b. suited to confirm: τίνι, Philippians 3:1 (so Josephus, Antiquities 3, 2, 1).

Topical Lexicon
Concept of Spiritual and Practical Security

The term expresses both inward firmness and outward reliability. Whether used of knowledge, personal safety, or eschatological hope, it underscores what cannot be shaken or called into doubt. Scripture applies the word to facts that cannot be disputed (Acts), a hope that cannot fail (Hebrews), and counsel that cannot harm but rather guards the believer (Philippians).

Occurrences and Contexts

Acts 21:34; Acts 22:30; Acts 25:26 – Roman commanders search for “the facts” or “something definite” regarding Paul. The historian Luke highlights that true certainty eludes human investigation apart from divine revelation.

Hebrews 6:19 – “We have this hope as an anchor for the soul, firm and steadfast.” The security of Christian hope rests not in circumstances but in the High Priest who has entered behind the veil.

Philippians 3:1 – “To write the same things to you is no trouble to me, and it is safe for you.” Repetition of apostolic teaching shields the church from error, showing that doctrinal stability is pastoral protection.

Historical Background

In the first-century Mediterranean world, legal and political systems prized “secure” documentation and testimony. Luke’s use of the term in Acts reflects that milieu, contrasting Rome’s quest for reliable evidence with the gospel’s unassailable truth. The Epistle to the Hebrews, likely written before the temple’s destruction, presents security in Christ as superior to the perceived stability of the Levitical order. Philippians, penned during imprisonment, demonstrates that genuine safety transcends physical chains.

Theological Significance

Safety in Christ – Hebrews 6:19 anchors the believer in the finished work of Jesus, revealing that assurance is objective, rooted in the unchangeable purpose of God.

Certainty of Revelation – Luke records repeated failures of Roman officials to establish the truth about Paul, subtly affirming that only God’s word offers final certainty (compare John 17:17).

Protective Repetition – Paul’s willingness to reiterate doctrine (Philippians 3:1) models how faithful teaching functions as a safeguard for the flock, paralleling Deuteronomy’s call to rehearse the law continually.

Ministry Applications

1. Pastoral Counseling – Direct doubting hearts to the “firm and steadfast” hope of Hebrews 6:19, emphasizing Christ’s ongoing intercession.
2. Apologetics – Highlight Acts’ portrayal of inadequate human inquiry to show that ultimate certainty resides in Scripture’s testimony.
3. Discipleship – Imitate Paul by reinforcing foundational truths; repetition promotes spiritual safety and inoculates against novelty-driven error.
4. Worship – Songs and liturgy that celebrate Christ as anchor and refuge cultivate congregational assurance.

Related Biblical Motifs

Anchor imagery – Isaiah 33:6; Psalm 18:2

God as refuge – Psalm 46:1; Proverbs 18:10

Certainty of the promise – Numbers 23:19; 2 Corinthians 1:20

Summary

Strong’s Greek 804 threads through narrative, doctrinal, and pastoral texts to proclaim that in a volatile world God alone provides what is truly secure: unassailable truth, unbreakable hope, and unfailing protection for His people.

Forms and Transliterations
ασφαλείς ασφαλες ασφαλές ἀσφαλές ἀσφαλὲς ασφαλη ασφαλή ἀσφαλῆ ασφαλής asphale asphalê asphalē asphalē̂ asphales asphalés asphalès
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Englishman's Concordance
Acts 21:34 Adj-ANS
GRK: γνῶναι τὸ ἀσφαλὲς διὰ τὸν
NAS: not find out the facts because
KJV: not know the certainty for the tumult,
INT: to know the certainty on account of the

Acts 22:30 Adj-ANS
GRK: γνῶναι τὸ ἀσφαλὲς τὸ τί
NAS: to know for certain why
KJV: have known the certainty wherefore
INT: to know the certainty the why

Acts 25:26 Adj-ANS
GRK: περὶ οὗ ἀσφαλές τι γράψαι
NAS: nothing definite about
KJV: I have no certain thing to write
INT: concerning whom definite anything to write

Philippians 3:1 Adj-NNS
GRK: ὑμῖν δὲ ἀσφαλές
NAS: trouble to me, and it is a safeguard for you.
KJV: but for you [it is] safe.
INT: for you moreover [is] safe

Hebrews 6:19 Adj-AFS
GRK: τῆς ψυχῆς ἀσφαλῆ τε καὶ
NAS: a [hope] both sure and steadfast
KJV: of the soul, both sure and stedfast,
INT: of the soul sure both and

Strong's Greek 804
5 Occurrences


ἀσφαλῆ — 1 Occ.
ἀσφαλὲς — 4 Occ.

803
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