Philippians 4:6

Translate, "Be anxious about nothing." Care and prayer are as mutually opposed as fire and water [BENGEL]. by prayer and supplication--Greek, "by the prayer and the supplication" appropriate to each case [ALFORD]. Prayer for blessings; and the general term. Supplication, to avert ills; a special term, suppliant entreaty (see on Eph 6:18). thanksgiving--for every event, prosperity and affliction alike (Th1 5:18; Jam 5:13). The Philippians might remember Paul's example at Philippi when in the innermost prison (Act 16:25). Thanksgiving gives effect to prayer (Ch2 20:21), and frees from anxious carefulness by making all God's dealings matter for praise, not merely for resignation, much less murmuring. "Peace" is the companion of "thanksgiving" (Phi 4:7; Col 3:15). let your requests be made known unto God--with generous, filial, unreserved confidence; not keeping aught back, as too great, or else too small, to bring before God, though you might feel so as to your fellow men. So Jacob, when fearing Esau (Gen 32:9-12); Hezekiah fearing Sennacherib (Kg2 19:14; Psa 37:5).

— Jamieson-Fausset-Brown Commentary (public domain)