Martin Luther's Definition of Faith
"Faith is not what some people think it is. Their human dream is a delusion. Because they observe that faith is not followed by good works or a better life, they fall into error, even though they speak and hear much about faith. “Faith is not enough,” they say, “You must do good works, you must be pious to be saved.” They think that, when you hear the gospel, you start working, creating by your own strength a thankful heart which says, “I believe.” That is what they think true faith is. But, because this is a human idea, a dream, the heart never learns anything from it, so it does nothing and reform doesn’t come from this `faith,’ either."