1991. epistérizó
Lexical Summary
epistérizó: To strengthen, to support, to establish

Original Word: ἐπιστηρίζω
Part of Speech: Verb
Transliteration: epistérizó
Pronunciation: eh-pee-stay-REE-zo
Phonetic Spelling: (ep-ee-stay-rid'-zo)
KJV: confirm, strengthen
NASB: strengthening, strengthened
Word Origin: [from G1909 (ἐπί - over) and G4741 (στηρίζω - strengthen)]

1. to support further, i.e. reestablish

Strong's Exhaustive Concordance
confirm, strengthen.

From epi and sterizo; to support further, i.e. Reestablish -- confirm, strengthen.

see GREEK epi

see GREEK sterizo

HELPS Word-studies

1991 epistērízō (from 1909 /epí, "suitably on, fitting" and 4741 /stērízō, "make firm") – properly, "prop up, uphold, support, confirm" (Souter), i.e. support (establish) in an apt, fitting way; to confirm as it builds on the Lord's previous work of faith (note the force of the prefix epi, "upon"). This process strengthens by extending the understanding that precedes, as it supports what must follow.

NAS Exhaustive Concordance
Word Origin
from epi and stérizó
Definition
to make stronger
NASB Translation
strengthened (1), strengthening (2).

Thayer's Greek Lexicon
STRONGS NT 1991: ἐπιστηρίζω

ἐπιστηρίζω; 1 aorist ἐπεστηριξα; a later word; to establish besides, strengthen more; to render more firm, confirm: τινα, one's Christian faith, Acts 14:22; Acts 15:32, 41; Acts 18:23 R G.

Topical Lexicon
Meaning and Concept

Strong’s Greek 1991 expresses the deliberate action of reinforcing believers so that their faith, resolve, and doctrinal footing are made firmer. It conveys more than a passing word of comfort; it pictures intentional follow-up that stabilizes new disciples and protects congregations from wavering.

Occurrences in Acts

Acts 14:22 records Paul and Barnabas “strengthening the disciples and encouraging them to continue in the faith. ‘We must endure many hardships to enter the kingdom of God,’ they said”. This first occurrence establishes the pattern: strengthening comes through exhortation that joins comfort with realistic expectation of tribulation.

Acts 15:32 shows Judas and Silas doing the same after the Jerusalem Council: “Both Judas and Silas, who themselves were prophets, said much to encourage and strengthen the brothers”. The context links strengthening with prophetic ministry that applies freshly clarified doctrine.

Acts 15:41 follows Paul and Silas as they revisit the churches in Syria and Cilicia, “strengthening the churches.” The revisiting itself is the method—personal presence, teaching, and accountability.

Acts 18:23 closes Paul’s second missionary journey: “After spending some time there, Paul set out again and traveled from place to place throughout the region of Galatia and Phrygia, strengthening all the disciples”. By this stage the young churches faced Judaizing pressure and lingering pagan influences; strengthening became essential for doctrinal purity and moral perseverance.

Apostolic Strategy of Strengthening

1. Re-visitation: Apostles refused to regard converts as finished products. They physically returned, valuing embodiment and face-to-face fellowship.
2. Exhortation and Teaching: The message combined theological clarity (justification apart from the Law) with ethical instruction (perseverance amid hardship).
3. Leadership Development: Strengthening involved appointing elders (Acts 14:23) so that local oversight would continue the work.
4. Corporate Stability: The plural “churches” in Acts 15:41 shows that entire assemblies, not only individuals, were fortified. Sound doctrine and unity advance together.

Confirmation of Doctrine and Discernment

The word appears around moments when the gospel’s purity is tested—Gentile inclusion (Acts 14–15) and Judaizing controversy (Acts 18). Strengthening therefore guards against error. It is inseparable from Scripture’s sufficiency: believers are secured by truth, not by ingenuity.

Pastoral Implications: Encouragement amid Trial

The hardships the early believers faced—persecution, cultural ostracism, internal doubt—mirror trials faced by Christians in every era. Strengthening provides:
• Endurance: anchoring hope in Christ’s kingdom.
• Perspective: interpreting suffering as normal to discipleship.
• Joy: prophetic encouragement that lifts hearts while correcting minds.

Continuing Relevance for the Church Today

Modern ministry that mirrors Acts will integrate evangelism with systematic follow-up. Churches strengthen disciples when they:
• Prioritize expository preaching that equips saints with whole-Bible counsel.
• Cultivate shepherd-elders who model holiness and guard doctrine.
• Practice mutual exhortation in small and large gatherings.
• Revisit mission fields, refusing to abandon new believers until local leadership matures.

The four uses of Strong’s 1991 form a cohesive narrative: the gospel plants churches, and intentional strengthening preserves them. The Spirit who empowered the apostles continues to fortify Christ’s body through Word-centered, relational ministry.

Forms and Transliterations
επεστήρικτο επεστηριξαν επεστήριξαν ἐπεστήριξαν επεστήριξας επεστηρίχθη επεστηρίχθην επιστηριζομένη επιστηριζοντες επιστηρίζοντες ἐπιστηρίζοντες επιστηριζων επιστηρίζων ἐπιστηρίζων επιστηρισθή επιστηριχθή επιστηριώ επιστοιβάσουσιν epesterixan epestērixan epestḗrixan episterizon episterízon epistērizōn epistērízōn episterizontes episterízontes epistērizontes epistērízontes
Links
Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Acts 14:22 V-PPA-NMP
GRK: ἐπιστηρίζοντες τὰς ψυχὰς
NAS: strengthening the souls
KJV: Confirming the souls of the disciples,
INT: strengthening the souls

Acts 15:32 V-AIA-3P
GRK: ἀδελφοὺς καὶ ἐπεστήριξαν
NAS: encouraged and strengthened the brethren
KJV: words, and confirmed [them].
INT: brothers and strengthened [them]

Acts 15:41 V-PPA-NMS
GRK: τὴν Κιλικίαν ἐπιστηρίζων τὰς ἐκκλησίας
NAS: and Cilicia, strengthening the churches.
KJV: and Cilicia, confirming the churches.
INT: Cilicia strengthening the churches

Acts 18:23 V-PPA-NMS
GRK: καὶ Φρυγίαν ἐπιστηρίζων πάντας τοὺς
INT: and Phrygian strengthening all the

Strong's Greek 1991
4 Occurrences


ἐπεστήριξαν — 1 Occ.
ἐπιστηρίζων — 2 Occ.
ἐπιστηρίζοντες — 1 Occ.

1990
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