The Divinity of the Holy Spirit is supported by a passage of St. John. This passage was, indeed, erased by heretics, but it is a vain attempt, since their faithlessness could thereby more easily be convicted. The order of the context is considered in order that this passage may be shown to refer to the Spirit. He is born of the Spirit who is born again of the same Spirit, of Whom Christ Himself is believed to have been born and born again. Again, the Godhead of the Spirit is inferred from two testimonies of St. John; and lastly, it is explained how the Spirit, the water, and the blood are called witnesses.