God saw their works, that they turned from their evil way. God repented of the evil which he said he would do to them, and he didn't do it.
"That God should choose to make his own actions contingent-at least in part-upon human actions is no limitation of his sovereignty. Having first decided to place the option of obedience and disobedience before nations, his holding them responsible for their actions automatically involves a sort of contingency. He promises blessing if they repent, punishment if not (cf. Jeremiah 18:7-10). But this hardly makes God dependent on the nations; it rather makes them dependent on him, as is the point of the lesson at the potter’s house in Jeremiah 18:1-11, and the point of the mourning decree in Jonah 3:5-9. God holds all the right, all the power, and all the authority." [Note: Stuart, p. 496.] 