Martin Luther 1483-1546
German Reformer
The sin underneath all or sins is to trust the lie of the serpent that we cannot trust the love and grace of Christ and must take matters into our own hands.

God does not need our good works, but our neighbor does​​!

By Faith we began, by hope we continue, by revelation we shall obtain the whole.

One learns more of Christ in being married and raising children than in several lifetimes spent in study and in a monastery​​​​

I frankly confess that even if it were possible I should not wish to have free choice given to me or to have anything left in my own hands by which I might strive for salvation

Christ died for me. He made his righteousness mine and made my sin his own. And if he made my sin his own, then I do not have it, I AM FREE!​​​​

Faith is a living, unshakable confidence in God's grace; it is so certain that someone wold die a thousand times for it.​​

This is the most dangerous trial of all when there is no trial and everything goes well; for then a man is tempted to forget God, to become too bold and to misuse times of prosperity.​​
Recommended books;
Commentary on Romans 5
Commentary on Galatians​​