Calvin: Why We Should Avoid the Term "Free Will"

7. In this way, then, man is said to have free will, not because he has a free choice of good and evil, but because he acts voluntarily, and not by compulsion. This is perfectly true: but why should so small a matter have been dignified with so proud a title? An admirable freedom! that man is not forced to be the servant of sin, while he is, however, ἐθελοδουλος (a voluntary slave); his will being bound by the fetters of sin. I abominate mere verbal disputes, by which the Church is harassed to no purpose; but I think we ought religiously to eschew terms which imply some absurdity, especially in subjects where error is of pernicious consequence. How few are there who, when they hear free will attributed to man, do not immediately imagine that he is the master of his mind and will in such a sense, that he can of himself incline himself either to good or evil? It may be said that such dangers are removed by carefully expounding the meaning to the people. But such is the proneness of the human mind to go astray, that it will more quickly draw error from one little word, than truth from a lengthened discourse. Of this, the very term in question furnishes too strong a proof. For the explanation given by ancient Christian writers having been lost sight of, almost all who have come after them, by attending only to the etymology of the term, have been led to indulge a fatal confidence.

John Calvin, Institutes of the Christian Religion, Book II.2.7