A certain contradiction, arising from truths previously established, seemingly makes its appearance at this point. If threefold personality is assumed in God, then, since number always follows division, some division will have to be acknowledged in God, whereby the three may be distinguished from one another. Thus supreme simplicity will be lacking in God. If three agree in some respect and differ in another, composition must be present; which is contrary to what was set forth above.” Again, if God must be strictly one, as was shown above, 118 and if one and the same thing cannot originate or proceed from itself, it seems impossible for God to be begotten or to proceed. Wrongly, therefore, the names of Father and of Son and of proceeding Spirit are given place in the Godhead.
St. Thomas Aquinas. (1265-1274). Compendium Theologiae: Seeming Contradiction in the Trinity, trans. by Cyril Vollert. St. Louis & London: B. Herder Book Co., 1947
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