You can get Martin Luther’s Concerning Christian Liberty on Amazon kindle for absolutely zero pounds, which, considering it is one of the classics of the last half millennium really isn’t half bad. It’s only 32 pages long (in my kindle version) so is a short and easy read. Here are my highlights to whet your appetite:
“A Christian man is the most free lord of all, and subject to none; a Christian man is the most dutiful servant of all, and subject to everyone.”
“This is that Christian liberty, our faith, the effect of which is, not that we should be careless or lead a bad life, but that no one should need the law of works for justification and salvation.”
“Christ, that rich and pious Husband, takes as a wife a needy and impious harlot, redeeming her from all her evils and supplying her with all His good things”
“works are not the means of his justification before God; he does them out of disinterested love to the service of God; looking to no other end than to do what is well-pleasing to Him whom he desires to obey most dutifully in all things.”
“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 fullness and riches of his own faith.”
Now I should just say that I think Luther’s view that the whole of Scripture could be divided into precept or promise is too simplistic, and I disagree with Luther’s view that the law has no place in the Christian life (but that’s a whole other much longer post!). But nonetheless, it is a little work well worth reading.