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.