Martin Luther on Free will

“Let all the 'free-will' in the world do all it can with all its strength; it will never give rise to a single instance of ability to avoid being hardened if God does not give the Spirit, or of meriting mercy if it is left to its own strength.”

“Throughout your treatment you forget that you said that 'free-will' can do nothing without grace, and you prove that 'free-will' can do all things without grace! Your inferences and analogies "For if man has lost his freedom, and is forced to serve sin, and cannot will good, what conclusion can more justly be drawn concerning him, than that he sins and wills evil necessarily?"”

“I frankly confess that, for myself, even if it could be, I should not want "free-will" to be given me, nor anything to be left in my own hands to enable me to endeavour after salvation; not merely because in face of so many dangers, and adversities and assaults of devils, I could not stand my ground ; but because even were there no dangers. I should still be forced to labour with no guarantee of success. But now that God has taken my salvation out of the control of my own will, and put it under the control of His, and promised to save me, not according to my working or running, but according to His own grace and mercy, I have the comfortable certainty that He is faithful and will not lie to me, and that He is also great and powerful, so that no devils or opposition can break Him or pluck me from Him. Furthermore, I have the comfortable certainty that I please God, not by reason of the merit of my works, but by reason of His merciful favour promised to me; so that, if I work too little, or badly, He does not impute it to me, but with fatherly compassion pardons me and makes me better. This is the glorying of all the saints in their God.”