Yet he continued—even after he had set up his new doctrine and completely broken with the Church—to recommend works of penance and mortification, declaring that they were necessary to withstand sinful concupiscence; nor does he even forget, agreeably with the Catholic view, to insist on the need of “discretion.” He also knows quite well what is the true purpose of works of penance in spite of all he was to say later in his subsequent caricature of the Catholic doctrine and practice. We hear him, for instance, saying in a sermon of 1519, when speaking of the fight to be waged against concupiscence: “For this purpose are watching, fasting, maceration of the body and similar works; everything is directed towards this end, nay, the whole of Scripture but teaches us how this grievous malady may be alleviated and healed.”[678] And, in his Sermon on Good Works (1520), he says: Works of penance “were instituted to damp and deaden our fleshly lusts and wantonness”; yet it is not lawful for one to “be one’s own murderer.”[679] All this militates against his own tale, that, in the convent, discretion had never been preached, and that, thanks to the trashy holiness-by-works, he had been on the highroad to self-destruction. The Sermon in question was preached some five years before the end of those “twenty years” during which, to use his later words, he had been his own “murderer” through his excessive and misguided penances. It may, however, be, that, for a short while, e.g. in the time of his first fervour as a novice, he may have failed now and then by excess of zeal in being moderate in his exercise of penance. This would also have been the time, when, tormented by scruples, he was ever in need of a confessor. To a man in such a state of unrest, penance, however, even when practised with discretion, may easily become a source of fresh confusion and error, and, when undertaken on blind impulse and used to excess, such a one tends to find excuses for himself for disregarding the prohibition both of the Rule and of his spiritual director. It is interesting to note the varying period during which Luther, according to his later sayings, was addicted to these excessive penances and to holiness-by-works. We already know that it was only gradually that he broke away from his calling, and that he had in reality long been estranged from it when he laid aside the Augustinian habit.