6. Hence the beginning of goodness or godliness is not in us, but in the Word of God. God must first let his Word sound in our hearts by which we learn to know and to believe him, and afterwards do good works. So we must believe from this that the publican had learned God’s Word. If not, it would certainly have been impossible for him to acknowledge himself to be a poor sinner, as this Gospel reports. Indeed, it has a different appearance here, because St. Luke seems to insist more strongly on external works and appearances than on faith, and lays the emphasis more on the outward character and conduct than on the root and on the faith of the heart within.
Nevertheless we must conclude that the publican had previously heard the Gospel. Otherwise his smiting his breast and his humble confession would not have occurred, had he not previously had faith in his heart.
7. This is also proper fruit, since it promotes God’s honor; as God desires nothing but the offering of praise, as Psalm 50:23, says: “Whoso offereth the sacrifice of thanksgiving glorifieth me, and to him that ordereth his way aright, will I show the salvation of God.” In this way the publican also proceeds, gives God the offering of thanksgiving and secures to himself the forgiveness of sin, and praises God, puts himself to shame and exalts the truth above himself.
Therefore we must praise and commend his work, because he gives God the highest honor and true worship. For he says: “God, be thou merciful to me a sinner.” As though he would say: I am a rogue, this I confess, as you yourself know. Here you see that he confesses the truth, and is willing that God should reprove and revile him; yea, he does this himself, and casts himself down the very lowest, and with God he again rises upward, gives glory to God that he is gracious, kind and merciful. But in himself he finds nothing but sin. Wherefore these are the true fruits of faith.
8. Thus we have learned from his fruits the publican’s faith. But how shall we understand what Christ says: “This man went down to his house justified,” as he had already been just through faith, before he smote his breast? He certainly must have been just before. Why then does Christ say here: “He went down to his house justified?” This is what I have often said, if faith be true, it will break forth and bear fruit. If the tree is green and good, it will not cease to blossom forth in leaves and fruit. It does this by nature. I need not first command it and say: Look here, tree, bear apples.
For if the tree is there and is good, the fruit will follow unbidden. If faith is present works must follow. If I confess that I am a sinner, it must follow that I will say: Alas God! I am a rogue, do thou cause me to be good. So this publican cares for nothing and speaks freely, though he puts himself to shame before all people, he does not care for that, as Psalm 116:10 says: “I believe, for I will speak. I was greatly afflicted,” and says: “God, be thou merciful to me a sinner!” As though he would say: I now see that I am lost, for I am a bad man, and acknowledge my sins. Unless I believe and hold to God’s mercy, and take the cup of the Savior and call upon God’s grace, I will be ruined.
9. Thus faith casts itself on God, and breaks forth and becomes certain through its works. When this takes place a person becomes known to me and to other people. For when I thus break forth I spare neither man nor devil, I cast myself down, and will have nothing to do with lofty affairs, and will regard myself as the poorest sinner on earth. This assures me of my faith. For this is what it says: “This man went down to his house justified.” Thus we attribute salvation as the principal thing to faith, and works as the witnesses of faith. They make one so certain that he concludes from the outward life that the faith is genuine.
10. We find this also in Abraham when he offers his son Isaac. Then God said: “For now I know that thou fearest God,” Genesis 22:12. Surely, if he had not feared God, he would not have offered his son; and by this we know the fruit to be thoroughly good. Let us now heartily apply this to ourselves.