A.T. Robertson Commentary Romans 15:5

"Now the God of patience and of comfort grant you to be of the same mind one with another according to Christ Jesus:" — Romans 15:5 (ASV)

The God of patience and comfort (ο θεος της υπομονης κα της παρακλησεως). Genitive case of the two words in verse 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"; 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 1:16,18; 2:25, though MSS. vary in Eph 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).