On the Providence of God, in so far as conducive to the solid instruction and consolation of believers, (for, as to satisfying the curiosity of foolish men, it is a thing which cannot be done, and ought not to be attempted,) enough would have been said, did not a few passages remain which seem to insinuate, contrary to the view which we have expounded, that the counsel of God is not firm and stable, but varies with the changes of sublunary affairs. First, in reference to the Providence of God, it is said that he repented of having made man, (Gen. 6:6,) and of having raised Saul to the kingdom, (1 Sam. 15:11,) and that he will repent of the evil which he had resolved to inflict on his people as soon as he shall have perceived some amendment in them, (Jer. 18:8.) Secondly, his decrees are sometimes said to be annulled. He had by Jonah proclaimed to the Ninevites, “Yet forty days and Nineveh shall be overthrown,” but, immediately on their repentance, he inclined to a more merciful sentence, (Jonah 3:4-10.) After he had, by the mouth of Isaiah, given Hezekiah intimation of his death, he was moved by his tears and prayers to defer it, (Is. 38:1,5; 2 Kings 20: 1,5 cf. II Chron. 32:34.) Hence many argue that God has not fixed human affairs by an eternal decree, but according to the merits of each individual, and as he deems right and just, disposes of each single year, and day, and hour.
Calvin, John. The John Calvin Collection: 12 Classic Works . Waxkeep Publishing. Kindle Edition.