The inner man cannot be forced to do out of his own free will, what he should do, except the grace of God change the heart and make it willing.
Martin LutherAll which happens through the whole world happens through hope. No husbandman would sow a grain of corn if he did not hope it would spring up and bring forth the ear; how much more we are helped on by hope in the eternal life.
Martin LutherDoes it follow from: 'turn ye' that therefore you can turn? Does it follow from "'Love the Lord thy God with all thy heart' (Deut 6.5) that therefore you can love with all your heart? What do arguments of this kind prove, but the 'free-will' does not need the grace of God, but can do all things by its own power....But it does not follow from this that man is converted by his own power, nor do the words say so; they simply say: "if thou wilt turn,telling man what he should do. When he knows it, and sees that he cannot do it, he will ask whence he may find ability to do it..." 164
Martin Luther