The God of patience and comfort (ο θεος της υπομονης κα της παρακλησεως). Genitive case of the two words in verse Romans 15:4 used to describe God who uses the Scriptures to reveal himself to us. See 2. Corinthians 1:3 for this idea; Romans 15:13 for "the God of hope"; Romans 15:33 for "the God of peace."
Grant you (δωιη υμιν). Second aorist active optative (Koine form for older δοιη) as in 2. Thessalonians 3:16; Ephesians 1:17; 2. Timothy 1:16; 2. Timothy 1:18; 2. Timothy 2:25, though MSS. vary in Ephesians 1:17; 2. Timothy 2:25 for δωη (subjunctive). The optative here is for a wish for the future (regular idiom).
According to Christ Jesus (κατα Χριστον Ιησουν). "According to the character or example of Christ Jesus" (2. Corinthians 11:17; Colossians 2:8; Ephesians 5:24).