Chapter 10 — Part I: The Creed — Article VIII: I Believe in the Holy Ghost
Section 4. "Holy Ghost" — The exposition of this Article, therefore, should begin with the force and meaning here attached to the words Holy Ghost. This appellation is equally true when applied to the Father and the Son, since both are spirit, both holy, and we confess that God is a Spirit; this name may also be applied to Angels, and the souls of the just. Care must be taken, therefore, that the faithful be not led into error by the ambiguity of the words.