2 Corinthians 13:3,4 (KJV)
3 Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you.
4 For though he was crucified through weakness, yet he liveth by the power of God. For we also are weak in him, but we shall live with him by the power of God toward you.
2 Corinthians 13:9-11 (KJV)
9 For we are glad, when we are weak, and ye are strong: and this also we wish, even your perfection.
10 Therefore I write these things being absent, lest being present I should use sharpness, according to the power which the Lord hath given me to edification, and not to destruction.
11 Finally, brethren, farewell. Be perfect, be of good comfort, be of one mind, live in peace; and the God of love and peace shall be with you.
2 Corinthians 13:5-7 (KJV)
5 Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?
6 But I trust that ye shall know that we are not reprobates.
7 Now I pray to God that ye do no evil; not that we should appear approved, but that ye should do that which is honest, though we be as reprobates.