This uncertainty, as I have argue in the previous note, is a mere incident of the ignorance and infirmity of our minds in dealing with a complex case of causality. To an omniscient mind there would be no uncertainty. Such a mind would read the contingent event as necessarily contained in and necessarily following from its causes. I speak of events of pure physical causation: for, as I have said, of such only is there question here. I allow for the dependence of all physical nature upon the free will of God, creating things, preserving them in being and activity, fixing a certain collocation of causes from the first, and occasionally by His own special action interfering (as man in an inferior way also interferes) with the course of nature, by what is called a miracle.
Of God and His Creatures: 1.67