A.T. Robertson Commentary Romans 15:13

"Now the God of hope fill you with all joy and peace in believing, that ye may abound in hope, in the power of the Holy Spirit." — Romans 15:13 (ASV)

The God of hope (ο θεος της ελπιδος). Taking up the idea in verse 12 as in verse 5 from 4.

Fill you (πληρωσα υμας). Optative (first aorist active of πληροω) of wish for the future. Cf. δωιη in verse 5.

In believing (εν τω πιστευειν). "In the believing" (εν with locative of the articular infinitive, the idiom so common in Luke's Gospel).

That ye may abound (εις το περισσευειν υμας). Purpose clause with εις το, as in verse 8, with περισσευειν (present active infinitive of περισσευω, with accusative of general reference, υμας). This verse gathers up the points in the preceding quotations.