2 Corinthians 13:3 in the King James Version
Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you.
Context
2 I have warned previously, and I warn again, as when I was present the second time, so now, being absent, I write to those who have sinned before now and to all the rest that if I come again, I will not spare,
3 seeing that you seek a proof of Christ who speaks in me who is not weak, but is powerful in you.
4 For he was crucified through weakness, yet he lives through the power of God. For we also are weak in him, but we will live with him through the power of God toward you.