3 “He who sits between the cherubims:” thou dost understand, “He is King: let the earth be stirred up.”...The Cherubim is the seat of God, as the Scripture shows us, a certain exalted heavenly throne, which we see not; but the Word of God knows it, knows it as His own seat: and the Word of God and the Spirit of God has Itself revealed to the servants of God where God sits. Not that God does sit, as does man; but thou, if you dost wish that God sit in you, if you will be good, shall be the seat of God; for thus is it written, “The soul of the righteous is the seat of wisdom.” For a throne is in our language called a seat.
For some, conversant with the Hebrew tongue, have interpreted cherubim in the Latin language (for it is a Hebrew term) by the words, fullness of knowledge. Therefore, because God surpasses all knowledge, He is said to sit above the fullness of knowledge. Let there be therefore in you fullness of knowledge, and even you shall be the throne of God....He knows all things: for our hairs are numbered before God. But the fullness of knowledge which He willed man to know is different from this; the knowledge which He willed you to have, pertains to the law of God.
And who can, you may perhaps say unto me, perfectly know the Law, so that he may have within himself the fullness of the knowledge of the Law, and be able to be the seat of God? Be not disturbed; it is briefly told you what you have, if you dost wish to have the fullness of knowledge, and to become the throne of God: for the Apostle says, “Love is the fulfilling of the Law.” What follows then? You have lost the whole of your excuse. Ask your heart; see whether it has love. If there be love there, there is the fulfilment of the Law there also; already God dwells in you, you have become the throne of God.
“Be the people angry;” what can the angry people do against him who has become the throne of God? You give heed unto them who rage against you: Who is it that sits within you, you give not heed. You have become a heaven, and do you fear the earth? For the Scripture says in another passage, that the Lord our God does declare, “The heaven is My throne.” If therefore even thou by having the fullness of knowledge, and by having love, hast been made the throne of God, you have become a heaven. For this heaven which we look up to with these eyes of ours, is not very precious before God. Holy souls are the heaven of God; the minds of the Angels, and all the minds of His servants, are the heaven of God.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)