(51) What is the meaning of, “And it shall be my covenant (or agreement) in your flesh?” (Genesis 17:13). God is willing to do good, not only to the man who is endued with virtue, but he wishes that the divine word should regulate not only his soul but his body also, as if it had become its physician. And it must be its care to prune away all excesses of seeing, and hearing, and taste, and smell, and touch, and also those of the instrument of voice and articulation, and also all the redundant and pernicious impulses of the genitals, as also of the whole body, the effect of which is, that at times we are delighted by our passions and at times pained by them.