Martin Luther on the Will

"It is false that the will, left to itself, can do good as well as evil, for it is not free, but in bondage."
"For, if by the command 'to love,' the nature of the law only be shewn, and what we ought to do, but not the power of the will or what we can do, but rather, what we cannot do. The same is shewn by all the other scriptures of requirement. For it is well known, that even the schoolmen, except the Scotinians and moderns, assert,that man cannot love God with all his heart. Therefore, neither can he perform any one of the other precepts, for all the rest, according to the testimony of Christ, hang on this one. Hence, by the testimony even of doctors of the schools, THIS remains as a settled conclusion: that the words of the law do not prove the power of Free-will, but shew what we ought to do, and what we cannot do. "
Bondage of the Will was Luther's masterpiece ... the fire that kindled the Reformation. Powerfully effective Reformation Classic! 
Reformation Theology