55. Then, in the same way as we here understand that where the Spirit is there also is Christ; so also, elsewhere, he shows that where Christ is, there also is the Holy Spirit. For having said: “Do ye seek a proof of Christ Who speaketh in me?” 2 Cor. xiii. 3. he says elsewhere: “For I think that I also have the Spirit of God.” 1 Cor. vii. 40. The Unity, then, is inseparable, for by the testimony of Scripture where either the Father or the Son or the Holy Spirit is designated, there is all the fulness of the Trinity.