William Tyndale
The Law and the Gospel are two keys. The Law is the key that shutteth up all men under condemnation, and the Gospel is the key which opens the door and lets them out.

If I was saved by a simple gospel, then I am bound to preach that same simple gospel 'till I die, so that others may be saved by it. When I cease to preach salvation by faith in Jesus, put me into a lunatic asylum, for you may be sure that my mind is gone.
Charles Spurgeon