He knows also the enigmas of the fasting of those days—I mean the Fourth and the Preparation. For the one has its name from Hermes, and the other from Aphrodite. He fasts in his life, in respect of covetousness and voluptuousness, from which all the vices grow. For we have already often above shown the three varieties of fornication, according to the apostle—love of pleasure, love of money, idolatry. He fasts, then, according to the Law, abstaining from bad deeds, and, according to the perfection of the Gospel, from evil thoughts. Temptations are applied to him, not for his purification, but, as we have said, for the good of his neighbours, if, making trial of toils and pains, he has despised and passed them by.