What is it to serve God and to do His will? Nothing else than to show mercy to our neighbor. For it is our own neighbor who needs our service; God in heaven needs it not.
Martin LutherIf I had to baptise a Jew, I would take him to the bridge of the Elbe, hang a stone around his neck and push him over with the words 'I baptise thee in the name of Abraham'.
Martin LutherWhere faith is not continually kept in motion and exercised, it weakens and decreases, so that it must indeed vanish; and yet we do not see nor feel this weakness ourselves, except in times of need and temptation, when unbelief rages too strongly; and yet for that very reason faith must have temptations in which it may battle and grow.
Martin LutherBut know that to serve God is nothing else than to serve your neighbor and do good to him in love, be it a child, wife, servant, enemy, friend....If you do not find yourself among the needy and the poor, where the Gospel shows us Christ, then you may know that your faith is not right, and that you have not yet tasted of Christ's benevolence and work for you.
Martin LutherIt is the part of a Christian to take care of his own body for the very purpose that, by its soundness and wellbeing, he may be enabled to labour, and to acquire and preserve property, for the aid of those who are in want, that thus the stronger member may serve the weaker member, and we may be children of God, and busy for one another, bearing one another's burdens, and so fulfiling the law of Christ.
Martin Luther