Selfishness, says the “Theologia Deutsch,” “makes the creature turn away from the unchangeable good to that which is changeable.” Even in the case of the devil, it tells us, the reason of his fall was “his I and my, his mine and me”; he fancied he was something, that something belonged to him and that he had a right to something.[615] In the Commentary on Romans Luther also speaks in impressive words against selfishness and its malice.[616] He makes use of every note at his command in order to warn us against this serpent. In these passages we might fancy we hear the voices of the mystic leaders of the faithful in the Middle Ages, even of a Bernard of Clairvaux. Nor is practical advice wanting; we are exhorted to earnest, humble prayer, to a watchful resistance—to be strengthened by practice—against the desires of self-love, even in small things, to mortify and to tame our flesh. We must go out of ourselves even in spiritual matters; everything, he says, depends in the spiritual life on self-abnegation: “God’s righteousness fills those only who seek to empty themselves of their own righteousness, He fills the hungry and the thirsty ... let us then tell God, so he says with all the enthusiasm his idea of grace gives him: “how glad are we to be empty, that Thou mayest be our fulness; how glad to be weak, that Thy strength may dwell within us; how glad to be sinners, that Thou mayest be justified in us; how glad to be fools, that Thou mayest be our wisdom; how glad to be unrighteous, that Thou mayest be our righteousness.”[617] Suffering sent by God, so the author frequently repeats almost in Tauler’s words, is to be accepted as a remedy against the disease of self-love not only with patience, but with joy. Pain, particularly inward pain, should be honoured like the cross of Christ (“_tribulatio velut crux Christi adoranda_”);[618] we must bear it bravely like true children of God and not take to flight like the servant, or the hireling.[619] In connection with selfishness Luther exposes his so-called “_theologia crucis_,” which, with the adjuncts he gives it, is quite in keeping with his ideas. He was also to advocate the theology of the cross in his disputations, endeavouring to show that it alone teaches us how to make a right use of earthly things.