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cf., Sent.I.D35.Q1.A1; SCG1.C44; QDeVer.Q2.A1; CT.BookI.C28; Metaph.Bk12.L8
Science is a knowledge of things by their causes. St. Thomas in his Summa displays with clarity what it means to have science of the things of God.
In this Article, he does not only seek to provide an "argument" for knowledge in God. There are dozens of "reasons" we can give for this. Rather, St. Thomas seeks to give an argument for God's knowledge that will explain its cause.
Here, he makes an interesting observation, i.e., that immateriality is the cause of intellection. From this point (that he proves in the article) he truly argues for the knowledge of God by giving its proper cause, i.e., God is intellection due to the fact that he is immaterial.