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cf., Sent.I.D39.Q1.A3; SCG1.C69; QDeVer.Q2.A9; QDeVer.Q20.A4.Rep1; QIII.Q2.A1; CT.BookI.C133
St. Thomas begins the article by proving the fact. For, it is easy to see how God's necessary knowledge is infinite, for, God could do infinite things.
Yet, it is less clear whether his free knowledge is infinite or not, since creation is not eternal. Yet, St. Thomas finds other grounds for also making the judgment that the object of the free knowledge of God is infinite. For, the thoughts and affections of creatures will go on for an eternity.