Chapter 10 — Part I: The Creed — Article VIII: I Believe in the Holy Ghost
Section 15. This same order of the Three Persons, which proves the Divinity of the Holy Ghost, is also found in the Epistle of St. John: There are three who give testimony in heaven, the Father, the Word, and the Holy Ghost, and these three are one; and also in that noble eulogy of the Holy Trinity, with which the Divine Praises and the Psalms are concluded: Glory be to the Father, and to the Son, and to the Holy Ghost.