[155] Defensio contra malignum Eccli judicium. (Lat. i, p. 356.) [156] Canoniset quisque quantum volet. (Ibid. p. 367.) These new attacks of Luther remained unanswered. The blindness of his enemies was as favourable to him as his own courage. They passionately defended secondary matters, and said not a word when they saw the foundations of Roman doctrine shaking under his hand. While they were eagerly defending some outworks, their intrepid adversary penetrated into the heart of the citadel, and there boldly planted the standard of truth; and hence their astonishment, when they saw the fortress sapped, blazing, and falling to pieces amid the flames, at the moment when they thought it impregnable, and were hurling defiance at their assailants. Thus it is that great changes are accomplished. [Sidenote: FIRST IDEAS ON THE LORD'S SUPPER.] The sacrament of the Lord's supper began, at this time, to engage Luther's attention. He looked for it in the mass, but in vain. One day, shortly after his return from Leipsic, he mounted the pulpit. Let us mark his words, for they are the first which he pronounced, on a subject which afterwards divided the Church and the Reformation into two parties. "In the holy sacrament of the altar," says he, "there are three things which it is necessary to know; the sign, which must be external, visible, and under a corporal form; the thing signified, which is internal, spiritual, and within the mind; and faith, which avails itself of both."[157] Had the definitions not been pushed farther, unity would not have been destroyed. [157] L. Op. (L.) xvii, p. 272. Luther continues. "It were good that the Church should, by a general council, decree that both kinds shall be distributed to all the faithful; not, however, on the ground that one kind is insufficient, for faith by itself would be sufficient." These bold words pleased his audience, though some were astonished and offended, and exclaimed, "This is false and scandalous."[158] [158] Ibid. p. 281. The preacher continues. "There is no union closer, deeper, or more inseparable than that between food and the body which is nourished by it. In the sacrament, Christ unites himself to us so closely that he acts in us as if he were identified with us. Our sins attack him. His righteousness defends us." But Luther, not deeming it enough to expound the truth, attacks one of the most fundamental errors of Rome.[159] The Roman Church pretends that the sacrament operates by itself, independently of the disposition of him who receives it. Nothing can be more convenient than such an opinion, since to it, both the eagerness with which the sacrament is sought, and the profits of the clergy are to be ascribed. Luther attacks this doctrine,[160] and maintains its opposite[161]--viz., that faith and a right disposition of heart are indispensable.