Comfort and stablish (parakalesai kai stērixai). First aorist active optative of wish for the future of two common verbs parakaleō (see 1Th 3:7; 1Th 4:18; 1Th 5:14) and sterizō (see 1Th 3:2, 1Th 3:13). God is the God of comfort (2Co 1:3-7) and strength (Rom 1:11; Rom 16:25).