As to repentance, we must hold that it can no more exist in God than ignorance, or error, or impotence. If no man knowingly or willingly reduces himself to the necessity of repentance, we cannot attribute repentance to God without saying either that he knows not what is to happen, or that he cannot evade it, or that he rushes precipitately and inconsiderately into a resolution, and then forthwith regrets it. But so far is this from the meaning of the Holy Spirit, that in the very mention of repentance he declares that God is not influenced by any feeling of regret, that he is not a man that he should repent. And it is to be observed, that, in the same chapter, both things are so conjoined, that a comparison of the passages admirably removes the appearance of contradiction. When it is said that God repented of having made Saul king, the term change is used figuratively. Shortly after, it is added, “The Strength of Israel will not lie nor repent; for he is not a man, that he should repent,” (1Sam. 15:29). In these words, his immutability is plainly asserted without figure. Wherefore it is certain that, in administering human affairs, the ordination of God is perpetual and superior to every thing like repentance. That there might be no doubt of his constancy, even his enemies are forced to bear testimony to it. For, Balaam, even against his will, behaved to break forth into this exclamation, “God is not a man, that he should lie; neither the son of man, that he should repent: has he said, and shall he not do it? or has he spoken, and shall he not make it good?” (Num. 23:19).
John Calvin, Institutes of the Christian Religion (trans. Henry Beveridge; Accordance electronic ed. Edinburgh: Calvin Translation Society, 1845), n.p.