Can a man be kept by his own confidence in what he believes? Peter had walked with Him three years, and he said it out loud, I will lay down my life for thy sake, and before the cock crew he had denied Him thrice. Ask why the Lord Jesus Christ said to a man who already believed, when thou art converted, strengthen thy brethren, and what such a man would have to be converted from. Jesus answered him, Wilt thou lay down thy life for my sake? Verily, verily, I say unto thee, The cock shall not crow, till thou hast denied me thrice.