John Calvin - The will can neither be turned to God, nor continue in God, unless by grace

In saying elsewhere that the will is not taken away by grace, but out of bad is changed into good, and after it is good is assisted, - [Augustine] only means, that man is not drawn as if by an extraneous impulses without the movement of the heart, but is inwardly affected so as to obey from the heart. Declaring that grace is given specially and gratuitously to the elect, he writes in this way to Boniface: "We know that Divine grace is not given to all men, and that to those to whom it is given, it is not given either according to the merit of works, or according to the merit of the will, but by free grace: in regard to those to whom it is not given, we know that the not giving of it is a just judgement from God," (August. ad Bonifac. Ep. 106.) In the same epistle, he argues strongly against the opinion of those who hold that subsequent grace is given to human merit as a reward for not rejecting the first grace. For he presses Pelagius to confess that gratuitous grace is necessary to us for every action, and that merely from the fact of its being truly grace, it cannot be the recompense of works. But the matter cannot be more briefly summed up than in the eighth chapter of his Treatise De Correptione et Gratia, where he shows, First, that human will does not by liberty obtain grace, but by grace obtains liberty. Secondly, that by means of the same grace, the heart being impressed with a feeling of delight, is trained to persevere, and strengthened with invincible fortitude. Thirdly, that while grace governs the will, it never falls; but when grace abandons it, it falls forthwith. Fourthly, that by the free mercy of God, the will is turned to good, and when turned, perseveres. Fifthly, that the direction of the will to good, and its constancy after being so directed, depend entirely on the will of God, and not on any human merit. Thus the will ... can neither be turned to God, nor continue in God, unless by grace; a will which, whatever its ability may be, derives all that ability from grace.


- John Calvin (Institutes of the Christian Religion, 2.3.14)