Thus it is thought by some that we should believe both the Son and the Holy Spirit to be the same Christ, preserving the distinction of Persons with the unity of the substance, since Christ both God and man is one Spirit, as it is written, The Spirit before our face, Christ the Lord; (Lam. 4:20.) the same Spirit is holy, for both the Father is holy, and the Son holy, and the Spirit holy. If then Christ is each, what difference is there except we know that it is not lawful for us to deny the divinay of Christ?
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).