III. This work faith teaches of itself. For if the heart looks for divine favor and relies upon it, how is it possible that a man should be greedy and worry? He must be sure beyond a doubt that God cares for him; therefore he does not cling to money; he uses it also with cheerful liberality for the benefit of his neighbor, and knows well that he will have enough, however much he may give away. For his God, Whom he trusts, will not lie to him nor forsake him, as it is written, Psalm xxxvii: "I have been young, and now am old; never have I seen a believing man, who trusts God, that is a righteous man, forsaken, or his child begging bread." Therefore the Apostle calls no other sin idolatry except covetousness, because this sin shows most plainly that it does not trust God for anything, expects more good from its money than from God; and, as has been said, it is by such confidence that God is truly honored or dishonored. And, indeed, in this Commandment it can be clearly seen how all good works must be done in faith; for here every one most surely feels that the cause of covetousness is distrust and the cause of liberality is faith. For because a man trusts God, he is generous and does not doubt that he will always have enough; on the other hand, a man is covetous and worries because he does not trust God. Now, as in this Commandment faith is the master-workman and the doer of the good work of liberality, so it is also in all the other Commandments, and without such faith liberality is of no worth, but rather a careless squandering of money. IV. By this we are also to know that this liberality shall extend even to enemies and opponents. For what manner of good deed is that, if we are liberal only to our friends? As Christ teaches, Luke vi, even a wicked man does that to another who is his friend. Besides, the brute beasts also do good and are generous to their kind. Therefore a Christian must rise higher, let his liberality serve also the undeserving, evil-doers, enemies, and the ungrateful, even as his heavenly Father makes His sun to rise on good and evil, and the rain to fall on the grateful and ungrateful. But here it will be found how hard it is to do good works according to God's Commandment, how nature squirms, twists and writhes in its opposition to it, although it does the good works of its own choice easily and gladly. Therefore take your enemies, the ungrateful, and do good to them; then you will find how near you are to this Commandment or how far from it, and how all your life you will always have to do with the practice of this work. For if your enemy needs you and you do not help him when you can, it is just the same as if you had stolen what belonged to him, for you owed it to him to help him. So says St. Ambrose, "Feed the hungry; if you do not feed him, you have, as far as you are concerned, slain him." And in this Commandment are included the works of mercy, which Christ will require at men's hands at the last day.