John Cassian

St. Paul is plainly referring to this when he says, "bodily exercise is profitable for a little, but godliness" (by which he surely means charity) "is profitable for all things, having the promise of the life that now is and of the life to come." What is said to be profitable for a little cannot be profitable forever and cannot (of itself) bring a man to the perfect life. The phrase "for a little" might mean one of two things. It might mean "for a short time," since these bodily exercises are not going to last as long as the man who practices them. Or it might mean "only of little profit." Corporal austerity brings the first beginnings of progress, but it does not beget that perfect charity which has the promise of this life and the life to come.