Martin Luther Quote

Here is the truly Christian life, here is faith really working by love, when a man applies himself with joy and love to the works of that freest servitude in which he serves others voluntarily and for nought, himself abundantly satisfied in the fulness and riches of his own faith.

First Principles of the Reformation, Or, The Ninety-five Theses and the Three Primary Works of Martin Luther (ed. 1883)