77. From all this we can conclude and see, in no dubious manner, whether a man is a Christian or not, and even whether a man has any religion or not. If from his faith and from his life a man does not regard adulteries as sins, then he is not a Christian, and neither has he any religion. And on the other hand, if a man shuns adulteries as sins, and especially if on that account he feels aversion for them, and still more especially if on that account he abhors them, then he has religion, and if he is in the Christian Church he is a Christian. (But more about these matters in the little work entitled De Conjugio, and in the meantime see what has been said on this subject in the work on Heaven and Hell, n. 366-386.)
