8 Further, do thou neither separate the Son from the Father, nor by making a confusion believe in a Son-Fatherhood; but believe that of One God there is One Only-begotten Son, who is before all ages God the Word; not the uttered word diffused into the air, nor to be likened to impersonal words; but the Word the Son, Maker of all who partake of reason, the Word who hears the Father, and Himself speaks. And on these points, should God permit, we will speak more at large in due season; for we do not forget our present purpose to give a summary introduction to the Faith.
Concerning His Birth of the Virgin.
Source: Catechetical Lectures (New Advent)