5431. phrontizó
Lexical Summary
phrontizó: To be thoughtful, to take care, to be concerned

Original Word: φροντίζω
Part of Speech: Verb
Transliteration: phrontizó
Pronunciation: fron-TID-zo
Phonetic Spelling: (fron-tid'-zo)
KJV: be careful
NASB: careful
Word Origin: [from a derivative of G5424 (φρήν - thinking)]

1. to exercise thought, i.e. be anxious

Strong's Exhaustive Concordance
be careful.

From a derivative of phren; to exercise thought, i.e. Be anxious -- be careful.

see GREEK phren

HELPS Word-studies

Cognate: 5431 phrontízō (ultimately from 5426 /phronéō, so J. Thayer etc., "acting out one's inner, visceral opinion") – properly, continuously connecting insight (enlightened inner perspective) to the necessary outward behavior (used only in Tit 3:8). See 5424 (phrēn).

NAS Exhaustive Concordance
Word Origin
from phrontis (thought)
Definition
to give heed, take thought
NASB Translation
careful (1).

Thayer's Greek Lexicon
STRONGS NT 5431: φροντίζω

φροντίζω; (φροντίς (`thought', from φρονέω)); from Theognis, and Herodotus down; to think, to be careful; to be thoughtful or anxious: followed by an infinitive Titus 3:8.

Topical Lexicon
Overview

Strong’s 5431 centers on deliberate, sustained attention—an active, thoughtful concern that moves beyond mere mental assent to planned engagement. In the Scriptures this careful mindfulness is never self-directed; it is oriented toward works that glorify God and bless neighbor.

Context in Titus 3:8

Paul writes, “This saying is trustworthy. And I want you to emphatically affirm these things, so that those who have believed God will be careful to devote themselves to good works. These things are excellent and profitable for the people.” (Titus 3:8). The verb expresses pastoral desire that saved people would habitually give strategic thought to good works. It is more than spontaneous charity; it is purposeful stewardship of redeemed life.

Titus, left in Crete to “set in order what was unfinished” (Titus 1:5), must build a community where sound doctrine produces observable fruit. Paul therefore urges him to keep repeating the gospel’s trustworthy word, knowing that repetition nourishes a culture of intentional service.

Theological Themes

1. Deliberate Discipleship: Salvation initiates a lifelong pattern of “careful devotion.” True belief births thoughtful obedience (compare Ephesians 2:8-10).
2. Stewardship of Grace: The call is grounded in justification by grace (Titus 3:4-7). The same grace that saves also educates believers “to live sensibly” (Titus 2:12).
3. Witness to Outsiders: Good works considered beforehand are “profitable for the people,” echoing Matthew 5:16 where visible deeds bring glory to the Father.
4. Unity of Doctrine and Practice: Orthodoxy (“trustworthy saying”) and orthopraxy (“good works”) are inseparable; thought fuels action.

Biblical Theology of Mindful Good Works

Scripture frequently links intentional thought with ethical living.
Psalm 111:2 values meditating on God’s works as a prelude to praise.
Proverbs 4:26 urges, “Make a level path for your feet,” highlighting planned righteousness.
Hebrews 10:24 commands believers to “consider how to spur one another on to love and good deeds.” The Greek verb there (katanoeō) also stresses reflection leading to action, paralleling the nuance of Strong’s 5431.

Historical Use in Greek Literature and the Septuagint

Outside the New Testament, the term appears in classical sources for civic planning and military strategy—contexts where inattention carried grave cost. The Septuagint employs cognate forms when depicting wise rulers who “take thought” for their people (for example, 2 Maccabees 4:16). The biblical writer adapts this everyday vocabulary of prudent oversight, redirecting it toward the church’s mission.

Implications for Ministry

Pastors emulate Paul’s pattern:
• Continual Affirmation—regularly stressing gospel foundations so congregations grasp the why of service.
• Cultivating Structures—designing ministries where members can prayerfully plan and enact good works.
• Modeling Reflective Service—leaders themselves think through the impact of their deeds (1 Timothy 4:15).

Neglect of careful consideration can lead to sporadic, ego-driven activism; Spirit-led reflection guards purity of motive and effectiveness.

Application for Contemporary Believers

• Schedule Grace: Budget time and resources intentionally for acts of mercy.
• Pray Strategically: Ask the Spirit to reveal specific needs and appropriate responses.
• Evaluate Regularly: Measure deeds against Scripture’s standard—are they “excellent and profitable”?
• Teach Repetitively: Parents and disciple-makers echo Paul’s exhortation, embedding the habit of thoughtful service in the next generation.

Related Scriptures

Titus 2:14; Titus 3:1-2; 1 Timothy 5:25; Hebrews 13:16; James 2:17-18.

Forms and Transliterations
εφρόντισα φουρίμ φροντίδι φροντίδος φροντιεί φροντίζει φροντίζη φροντίζωσι φροντιζωσιν φροντίζωσιν φρουράν φρουράς phrontizosin phrontizōsin phrontízosin phrontízōsin
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Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Titus 3:8 V-PSA-3P
GRK: διαβεβαιοῦσθαι ἵνα φροντίζωσιν καλῶν ἔργων
NAS: God will be careful to engage
KJV: in God might be careful to maintain
INT: to affirm strongly that might take care good works

Strong's Greek 5431
1 Occurrence


φροντίζωσιν — 1 Occ.

5430
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