12 For my part, I have ever wondered at the curiosity of the bold men, who by their imagined reverence fall into impiety. For though they know nothing of Thrones, and Dominions, and Principalities, and Powers, the workmanship of Christ, they attempt to scrutinise their Creator Himself. Tell me first, O most daring man, wherein does Throne differ from Dominion, and then scrutinise what pertains to Christ. Tell me what is a Principality, and what a Power, and what a Virtue, and what an Angel: and then search out their Creator, for all things were made by Him. But you will not, or you can not ask Thrones or Dominions.
What else is there that knows the deep things of God , save only the Holy Ghost, who spoke the Divine Scriptures? But not even the Holy Ghost Himself has spoken in the Scriptures concerning the generation of the Son from the Father. Why then do you busy yourself about things which not even the Holy Ghost has written in the Scriptures? Thou that know not the things which are written, busiest you yourself about the things which are not written? There are many questions in the Divine Scriptures; what is written we comprehend not, why do we busy ourselves about what is not written? It is sufficient for us to know that God has begotten One Only Son.
Source: Catechetical Lectures (New Advent)