Augustine of Hippo — as excerpted in the Catena Aurea on John 5:19-20

“(Tr. xxi. s. 2) Having said that He did the same things that the Father did, and in a like way, He adds, For the Father loveth the Son, and sheweth Him all things that Himself doeth. And sheweth Him all things that Himself doeth: this has a reference to the words above; But what He seeth the Father do. But again, our human ideas are perplexed, and one may say, So then the Father first does something, that the Son may see what He does; just as an artificer teaches his son his art, and shews him what he makes, that he may be able to make the same after him. On this supposition, when the Father does a thing, the Son does not do it; in that the Son is beholding what His Father doeth. But we hold it as a fixed and incontrovertible truth, that the Father makes all things through the Son, and therefore He must shew them to the Son, before He makes them. And where does the Father shew the Son what He makes, except in the Son Himself, by whom He makes them? For if the Father makes a thing for a pattern, and the Son attends to the workmanship as it goes on, where is the indivisibility of the Trinity? The Father therefore does not shew the Son what He doeth by doing it, but by shewing doeth it, through the Son. The Son seeth, and the Father sheweth, before a thing is made, and from the shewing of the Father, and the seeing of the Son, that is made which is made; made by the Father, through the Son. But thou wilt say, I shew my Son what I wish him to make, and he makes it, and I make it through him. True; but before thou doest any thing, thou shewest it to thy son, that he may do it for thy example, and thou by him; but thou speakest to thy son words which are not thyself; whereas the Son Himself is the Word of the Father; and could He speak by the Word to the Word? Or, because the Son was the great Word, were lesser words to pass between the Father and the Son, or a certain sound and temporary creation, as it were, to go out of the mouth of the Father, and strike the ear of the Son? Put away these bodily notions, and if thou art simple, see the truth in simplicity. If thou canst not comprehend what God is, comprehend at least what He is not. Thou wilt have advanced no little way, if thou thinkest nothing that is untrue of God. See what I am saying exemplified in thine own mind. Thou hast memory, and thought, thy memory sheweth to thy thought Carthage: before thou perceivest what is in her, she sheweth it to thought, which is turned toward her: the memory then hath shewn, the thought hath perceived, and no words have passed between them, no outward sign been used. But whatever is in thy memory, thou receivest from without: that which the Father sheweth to the Son, He doth not receive from without; the whole goes on within; there being no creature existing without, but what the Father hath made by the Son. And the Father maketh by shewing, in that He maketh by the Son who sees. The Father’s shewing begets the Son’s seeing, as the Father begets the Son? Shewing begets seeing, not seeing shewing. But it would be more correct, and more spiritual, not to view the Father as distinct from His shewing, or the Son from His seeing.”