2 For thus shall we raise our thoughts higher than the Jews, who admit indeed by their doctrines that there is One God, (for what if they often denied even this by their idolatries?); but that He is also the Father of our Lord Jesus Christ, they admit not; being of a contrary mind to their own Prophets, who in the Divine Scriptures affirm, The Lord said unto me, You are My Son, this day have I begotten you. And to this day they rage and gather themselves together against the Lord, and against His Anointed, thinking that it is possible to be made friends of the Father apart from devotion towards the Son, being ignorant that no man comes unto the Father but by the Son, who says, I am the Door, and I am the Way. He therefore that refuses the Way which leads to the Father, and he that denies the Door, how shall he be deemed worthy of entrance unto God?
They contradict also what is written in the eighty-eighth Psalm, He shall call Me, You are my Father, my God, and the helper of my salvation. And I will make him my first-born, high among the kings of the earth. For if they should insist that these things are said of David or Solomon or any of their successors, let them show how the throne of him, who is in their judgment described in the prophecy, is as the days of heaven, and as the sun before God, and as the moon established for ever. And how is it also that they are not abashed at that which is written, From the womb before the morning-star have I begotten you: also this, He shall endure with the sun, and before the moon, from generation to generation. To refer these passages to a man is a proof of utter and extreme insensibility.
Source: Catechetical Lectures (New Advent)