Far from drawing back, Luther uniformly continued to advance, and at this time struck one of his severest blows at error, by publishing his first commentary on the Epistle to the Galatians.[153] It is true, the second commentary was superior to the first; but still the first contained a forcible exposition of the doctrine of justification by faith. Every expression of the new apostle was full of life, and God employed him to imbue the hearts of the people with divine knowledge. "Christ gave himself for our sins," said Luther to his contemporaries.[154] "It was not silver or gold that he gave for us, nor was it a man or angels. He gave himself--himself, out of whom there is no true greatness; and this incomparable treasure he gave ... for our sins. Where, now, are those who proudly boast of the powers of our will? where are the lessons of moral philosophy? where the power and strength of the law? Our sins being so great that they cannot possibly be taken away without an immense ransom, shall we pretend to acquire righteousness by the energy of our will, by the power of the law, and the doctrines of men? What will all these cunning devices, all these illusions, avail us? Ah! we will only cover our iniquities with a spurious righteousness and convert ourselves into hypocrites, whom no worldly power can save." [153] 3rd September, 1519. [154] L. Op. (L.) x, 461. But while Luther thus proves that man's only salvation is in Christ, he also shows how this salvation changes his nature, and enables him to abound in good works. "The man," says he, "who has truly heard the word of Christ, and keeps it, is immediately clothed with the spirit of charity. If thou lovest him who has made thee a present of twenty florins, or done thee some service, or in some way given thee a proof of his affection, how much more oughtest thou to love him, who, on thy account, has given not silver or gold, but himself, received so many wounds, endured a bloody sweat, and even died for thee; in one word, who, in paying for all thy sins, has annihilated death, and secured for thee a Father full of love in heaven!... If thou lovest him not, thy heart has not listened to the things which he has done; thou hast not believed them; for faith works by love." "This epistle," said Luther, in speaking of the Epistle to the Galatians, "is my epistle--I am married to it." His opponents caused him to proceed at a quicker pace than he would otherwise have done. At this time Eck instigated the Franciscans of Juterbock to make a new attack upon him; and Luther, in his reply,[155] not satisfied with repeating what he had already taught, attacked errors which he had recently discovered. "I would fain know," says he, "in what part of Scripture the power of canonising saints has been given to the popes; and also what the necessity, or even the utility is, of canonising them?"... "However," adds he, ironically, "let them canonise as they will."[156]