20 Let no one then defile with his godless interpretations the mystery of great godliness which was manifested in the flesh, or reckon himself equal to the Only-begotten in respect of His divine substance. Let Him be our brother and our fellow, inasmuch as the Word made flesh dwelt among us, inasmuch as the man Jesus Christ is Mediator between God and man. Let Him, after the manner of servants, have a common Father and a common God with us, and as anointed above His fellows, let Him be of the same nature as His anointed fellows, though His be an unction of special privilege. In the mystery of the Mediatorship let Him be at once very man and very God, Himself God of God, but having a common Father and God with us in that community by which He is our brother.
Source: On the Trinity (New Advent)