Commentary on the Apostles' Creed

³⁵ And in the Holy Ghost. What has been delivered above somewhat at large concerning Christ relates to the mystery of His Incarnation and of His Passion, and, by thus intervening, as belonging to His Person, has somewhat delayed the mention of the Holy Spirit. Otherwise, if the divine nature alone be taken into account, as in the beginning of the Creed we say “I believe in God the Father Almighty,” and afterwards, “In Jesus Christ His only Son our Lord,” so in like manner we add, “And in the Holy Ghost.” But all of these particulars which are spoken of above concerning Christ relate, as we have said, to the dispensation of the flesh (to His Incarnation). By the mention of the Holy Spirit, the mystery of the Trinity is completed. For as one Father is mentioned, and there is no other Father, and one only-begotten Son is mentioned, and there is no other only-begotten Son, so also there is one Holy Ghost, and there cannot be another Holy Ghost. In order, therefore, that the Persons may be distinguished, the terms expressing relationship (the properties) are varied, whereby the first is understood to be the Father, of Whom are all things, Who Himself also has no Father, the second the Son, as born of the Father, and the third the Holy Ghost, as proceeding from both, and sanctifying all things. But that in the Trinity one and the same Godhead may be set forth, since, prefixing the preposition “in” we say that we believe “in God the Father,” so also we say, “in Christ His Son,” so also “in the Holy Ghost.” But our meaning will be made more plain in what follows. For the Creed proceeds—

36. “The Holy Church; The Forgiveness of Sin, the Resurrection of This Flesh.” It is not said, “In the holy Church,” nor “In the forgiveness of sins,” nor “In the resurrection of the flesh.” For if the preposition “in” had been added, it would have had the same force as in the preceding articles. But now in those clauses in which the faith concerning the Godhead is declared, we say “In God the Father,” and “In Jesus Christ His Son,” and “In the Holy Ghost,” but in the rest, where we speak not of the Godhead but of creatures and mysteries, the preposition “in” is not added. We do not say “We believe in the holy Church,” but “We believe the holy Church,” not as God, but as the Church gathered together to God: and we believe that there is “forgiveness of sins;” we do not say “We believe in the forgiveness of sins;” and we believe that there will be a “Resurrection of the flesh;” we do not say “We believe in the resurrection of the flesh.” By this monosyllabic preposition, therefore, the Creator is distinguished from the creatures, and things divine are separated from things human.

This then is the Holy Ghost, who in the Old Testament inspired the Law and the Prophets, in the New the Gospels and the Epistles. Whence also the Apostle says, “All Scripture given by inspiration of God is profitable for instruction.” And therefore it seems proper in this place to enumerate, as we have learned from the tradition of the Fathers, the books of the New and of the Old Testament, which, according to the tradition of our forefathers, are believed to have been inspired by the Holy Ghost, and have been handed down to the Churches of Christ.