Acts 15:18 - Wesley's Explanatory Notes

Known unto God are all his works from eternity — Which the apostle infers from the prophecy itself, and the accomplishment of it. And this conversion of the Gentiles being known to him from eternity, we ought not to think a new or strange thing. It is observable, he does not speak of God's works in the natural world, (which had been nothing to his present purpose,) but of his dealing with the children of men. Now he could not know these, without knowing the characters and actions of particular persons, on a correspondence with which the wisdom and goodness of his providential dispensations is founded. For instance, he could not know how he would deal with heathen idolaters (whom he was now calling into his Church) without knowing there would be heathen idolaters: and yet this was a thing purely contingent, a thing as dependent on the freedom of the human mind, as any we can imagine. This text, therefore, among a thousand more, is an unanswerable proof, that God foreknows future contingencies, though there are difficulties relating hereto which men cannot solve.