135. But they are unable to show us this, and demand our authority from us, namely, that we should show by texts that the Holy Spirit has not sinned, as it is said of the Son that He did no sin. Let them learn that we teach by authority of the Scriptures; for it is written: “For in Wisdom is a Spirit of understanding, holy, one only, manifold, subtle, easy to move, eloquent, undefiled.” The Scripture says He is undefiled, has it lied concerning the Son, that you should believe it to have lied concerning the Spirit? For the prophet said in the same place concerning Wisdom, that nothing that defiles enters into her. She herself is undefiled, and her Spirit is undefiled. Therefore if the Spirit have not sin, He is God.