Chapter 10 — Part I — Article VIII (Of the Holy Ghost)
Section 242. Q. Does the doctrine of the procession of the Holy Ghost from the Father admit of any change or supplement? A. No. First, because the Orthodox Church, in this doctrine, repeats the very words of Jesus Christ; and his words, without doubt, are an exact and perfect expression of the truth. Secondly, because the second œcumenical Council, whose chief object was to establish the true doctrine respecting the Holy Ghost, has without doubt sufficiently set forth the same in the Creed; and the Catholic Church has acknowledged this so decidedly, that the third œcumenical Council in its seventh canon forbade the composition of any new Creed. For this cause John Damascene writes: Of the Holy Ghost, we both say that he is from the Father, and call him the Spirit of the Father; while we nowise say that he is from the Son, but only call him the Spirit of the Son. (Theol. lib. i. c. 11; v. 4.)