QUOTATION: The relation of the Father to the Son

God is therefore truly the Father, inasmuch as He is Father of truth; He does not create the Son from outside Himself, but generates Him from His own substance. That is to say, being wise, He generates Wisdom, being just, Justice, being eternal, the Eternal, being immortal, the Immortal, being invisible, the Invisible. Because He is Light, He generates Brightness, and because He is Mind, the Word.

--Rufinus, Commentary on the Apostles’ Creed, 4.

QUOTATION: Jesus Depends on God the Father

Now, Jesus Christ manifests His humility in His dependence on His Divine Father. He refers to Him all glory, and declares that He Himself receives from Him His being, action, word, even His thought. If men proclaim Him good, He replies that God alone is good. If they ask of Him miracles, He invokes His Father before working them, as if demanding of Him the power to do so, and He avows that the Son has nothing of Himself: " Filius a se non habet quidquam." He is Man. His human nature is created and dependent on God. He desires to maintain it in this dependence in the eyes of all, in order to give us the most sublime example of humility, for that same humanity, by its union with the Word, was worthy of acting by itself and of receiving all homage and adoration. But Our Lord wished to inculcate humility by practising it in voluntary and and absolute dependence on His Father.

--St. Peter Julian Eymard

QUOTATION: Divine Generation

It must be known that different things have different modes of generation. The generation of God is different from that of other things. Hence, we cannot arrive at a notion of divine generation except through the generation of that created thing which more closely approaches to a likeness to God. We have seen that nothing approaches in likeness to God more than the human soul. The manner of generation in the soul is effected in the thinking process in the soul of man, which is called a conceiving of the intellect. This conception takes its rise in the soul as from a father, and its effect is called the word of the intellect or of man. In brief, the soul by its act of thinking begets the word. So also the Son of God is the Word of God, not like a word that is uttered exteriorly (for this is transitory), but as a word is interiorly conceived; and this Word of God is of the one nature as God and equal to God.

--St. Thomas Aquinas, The Catechetical Instruction of St. Thomas Aquinas