All this, as Luther says in his “Von der Freyheyt eynes Christen Menschen,” must be performed “by a free, willing, cheerful and unrequited serving of our neighbour”;[85] it must be done “cheerfully and gladly for Christ’s sake Who has done so much for us.”[86] “That same Law which once was hateful to free-will,” he says in his Commentary on Galatians, “now [i.e. after we have received the faith and assurance of salvation] becomes quite pleasant since love is poured into our hearts by the Holy Ghost.... We now are lovers of the Law.”[87] From the wondrous well-spring of the imputed merits of Christ there comes first and foremost prayer; if only we cling “trustfully to the promise of grace,” then “the heart will unceasingly beat and pulsate to such prayers as the following: O, beloved Father, may Thy Name be hallowed, Thy Kingdom come, Thy Will be done.”[88] But all is not prayer and holy desire; even when the “soul has been cleansed by faith,” the Christian still must struggle against sin and against the body “in order to deaden its wantonness.”[89] The Christian will set himself to acquire chastity; “in this work a good, strong faith is of great help, more so here than anything else.” And why? Because whoever is assured of salvation in Christ and “enjoys the grace of God, also delights in spiritual purity.... Under such a faith the Spirit without doubt will tell him how to avoid evil thoughts and everything opposed to chastity. For as faith in the Divine mercy persists and works all good, so also it never ceases to inform us of all that is pleasing or displeasing to God.”[90] Whence does our will derive the ability and strength to wage this struggle to the end? Only from the assurance of salvation, from its unshaken awareness that it has indeed a Gracious God. For this certainty of faith sets one free, first of all from those anxieties with regard to one’s salvation with which the righteous-by-works are plagued and thus allows one to devote time and strength to doing what is good; secondly this faith in one’s salvation teaches one how to overcome the difficulties that stand in one’s way.[91] There was, however, an objection raised against Luther by his contemporaries and which even presented itself to his own mind: Why should a lifelong struggle and the performance of good works be requisite for a salvation of which we are already certain? It was re-formulated even by Albert Ritschl, in whose work, “Rechtfertigung und Versöhnung,” we find the words: “If one asks why God, Who makes salvation to depend on Justification by faith, prescribes good works at all, the arbitrary character of the assumption becomes quite evident.”[92] In Luther’s own writings we repeatedly hear the same stricture voiced: “If sin is forgiven me gratuitously by God’s Mercy and is blotted out in baptism, then there is nothing for me to do.” People say, “If faith is everything and suffices of itself to make us pious, why then are good works enjoined?”[93]