galatians 5

Behold, from faith thus flow forth love and joy in the Lord, and from love a joyful, willing, and free mind that serves one’s neighbor willingly and takes no account of gratitude or ingratitude, or praise or blame, of gain or loss.  For a man does not serve that he may put men under obligations. He does not distinguish between friends and enemies or anticipate their thankfulness or unthankfulness, but he most freely and most willingly spends himself and all that he has, whether he wastes all on the thankless or whether he gains a reward…Just as our neighbor is in need and lacks that in which we abound, so we were in need before God and lacked his mercy.  Hence, as our heavenly Father has in Christ freely come to our aid, we also ought freely to help our neighbor through our body and its works, and each one should become as it were a Christ to the other that we may be Christs to one another… The Freedom of a Christian (1520) in Luther’s Works, volume 31, page 367