25 I can conceive of no man so destitute of ordinary reason as to recognise in each of the Gospels confessions by the Son of the humiliation to which He has submitted in taking a body upon Him—as for instance His words, often repeated, Father, glorify Me, and You shall see the Son of Man, and The Father is greater than I, and, more strongly, Now is My soul troubled exceedingly, and even this, My God, My God, why have You forsaken me ? and many more, of which I shall speak in due time,— and yet, in the face of these constant expressions of His humility, to charge Him with presumption because He calls God His Father, as when He says, Every plant, which my heavenly Father has not planted, shall be rooted up, or, You have made my Father's house an house of merchandise. I can conceive of no one foolish enough to regard His assertion, consistently made, that God is His Father, not as the simple truth sincerely stated from certain knowledge, but as a bold and baseless claim.
We cannot denounce this constantly professed humility as an insolent demand for the rights of another, a laying of hands on what is not His own, an appropriation of powers which only God can wield. Nor, when He calls Himself the Son, as in, For God sent not His Son into this world to condemn the world, but that the world through Him might be saved, and in, Do you believe in the Son of God ? can we accuse Him of what would be an equal presumption with that of calling God His Father.
But what else is it than such an accusation, if we allow to Jesus Christ the name of Son by adoption only? Do we not charge Him, when He calls God His Father, with daring to make a baseless claim? The Father's voice from heaven says Hear Him. I hear Him saying, Father, I thank You, and Say ye that I blasphemed, because l said, I am the Son of God ? If I may not believe these names, and assume that they mean what they assert, how am I to trust and to understand?
No hint is given of an alternative meaning. The Father bears witness from heaven, This is My Son; the Son on His part speaks of My Father's house, and My Father. The confession of that name gives salvation, when faith is demanded in the question, Do you believe in the Son of God? The pronoun My indicates that the noun which follows belongs to the speaker. What right, I demand, have you heretics to suppose it otherwise? You contradict the Father's word, the Son's assertion; you empty language of its meaning, and distort the words of God into a sense they cannot bear. On you alone rests the guilt of this shameless blasphemy, that God has lied concerning Himself.
Source: On the Trinity (New Advent)