Paul instructs Titus in 3:8 about what believers should φροντίζωσιν—be careful to devote themselves to good works. The verb combines φροντίς (thought, care) with verbal form: to give thoughtful attention, to take pains about something. Classical usage ranged from 'consider' to 'be anxious' to 'take care of,' always involving mental engagement leading to action. The subjunctive mood in Titus suggests purpose or result: these things are trustworthy so that believers may give careful attention to good works. Good works don't happen accidentally; they require intentional, thoughtful devotion.