8 Nevertheless, saving the unspeakableness of that Sovereign Majesty, lest when we shall have produced certain similitudes against them, any one should think that we have by them arrived at that which cannot be expressed or conceived by babes (and if it can be at all even by the more advanced, it can only be in part, only in a riddle, only “through a glass;” but not as yet, “face to face”), let us too produce certain similitudes against them, whereby they may be refuted, not “it” comprehended. For when we say that it may very possibly happen, that it may be understood, that He may both be born, and yet Coeternal with Him of whom He was born, in order to refute this, and prove it as it were to be false, they bring forth similitudes against us. From whence? From the creatures, and they say to us, “Every man of course was before he begot a son, he is greater in age than his son; and so a horse was before he begot his foal, and a sheep, and the other animals.” Thus do they bring similitudes from the creatures.
Source: Sermons on Selected Lessons of the New Testament (New Advent)