Where faith is not continually kept in motion and exercised, it weakens and decreases, so that it must indeed vanish; and yet we do not see nor feel this weakness ourselves, except in times of need and temptation, when unbelief rages too strongly; and yet for that very reason faith must have temptations in which it may battle and grow.
Martin LutherIt is false that the will, left to itself, can do good as well as evil, for it is not free, but in bondage...On the side of man there is nothing that goes before grace, unless it be impotency and even rebellion.
Martin Luther