721. At every period in the past, and among all peoples, there have been men who have lived a life of ascetic mortification; is such a life meritorious from any point of view?
"Ask yourselves to whom such a life is useful, and you will have the reply to your question. If such a life is only for him who leads it, and if it prevents him from doing good to others, it is only a form of selfishness, whatever the pretext with which it is coloured. True mortification, according to the dictates of Christian charity, is to impose privation and labour upon yourselves for the good of others."