Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you.
since you are demanding proof that Christ is speaking through me. He is not weak in dealing with you, but is powerful among you.
ἐπεὶ δοκιμὴν ζητεῖτε τοῦ ἐν ἐμοὶ λαλοῦντος Χριστοῦ, ὃς εἰς ὑμᾶς οὐκ ἀσθενεῖ, ἀλλὰ δυνατεῖ ἐν ὑμῖν·
epei dokimēn zēteite toy en emoi laloyntos Christoy, os eis ymas oyk asthenei, alla dynatei en ymin·