Chapter 10 — Part I: The Creed — Article VIII: I Believe in the Holy Ghost
Section 23. Christ the Lord, speaking of the Holy Ghost, says: He shall glorify me, because he shall receive of mine. We also find that the Holy Ghost is sometimes called in Scripture the Spirit of Christ, sometimes, the Spirit of the Father; that He is one time said to be sent by the Father, another time, by the Son, -- all of which clearly signifies that He proceeds alike from the Father and the Son. He, says St. Paul, who has not the Spirit of Christ belongs not to him. In his Epistle to the Galatians he also calls the Holy Ghost the Spirit of Christ: God hath sent the Spirit of his Son into your hearts, crying: Abba, Father. In the Gospel of St. Matthew, He is called the Spirit of the Father: It is not you that speak, but the Spirit of your Father that speaketh in you.