St. Thomas Aquinas, Summa Theologiae, Prima Pars, Q. 14, A. 9: “Whatever therefore can be made, or thought, or said by the creature, as also whatever He [God] Himself can do, all are known to God, although they are not actual. And in so far it can be said that He has knowledge of things that are not.”
St. Thomas Aquinas, Summa Theologiae, Prima Pars, Q. 14, A. 13: “Hence all things that are in time are present to God from eternity, not only because He has the types of things present with Him, as some say; but because His glance is carried from eternity over all things as they are in their presentiality. Hence it is manifest that contingent things are infallibly known by God, inasmuch as they are subject to the divine sight in their presentiality; yet they are future contingent things in relation to their own causes.”
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