A.T. Robertson Commentary John 16:24

"Hitherto have ye asked nothing in my name: ask, and ye shall receive, that your joy may be made full." — John 16:24 (ASV)

Hitherto (εως αρτ). Up till now the disciples had not used Christ's name in prayer to the Father, but after the resurrection of Jesus they are to do so, a distinct plea for parity with the Father and for worship like the Father.

May be fulfilled (η πεπληρωμενη). Periphrastic perfect passive subjunctive of πληροω in a purpose clause with ινα. See 15:11 for some verb (first aorist passive subjunctive with ινα) and 1 John 1:4 for same form as here, emphasizing the abiding permanence of the joy.