25. But lest the objectors should think that the Apostle was in error, let them learn whom he followed as his authority for his belief. The Lord said in the Gospel: “When the Paraclete is come, Whom I will send to you from My Father, even the Spirit of Truth which proceedeth from the Father, He shall bear witness of Me.” S. John xv. 26. So the Holy Spirit both proceeds from the Father, and bears witness of the Son. For the witness Who is both faithful and true bears witness of the Father, than which witness nothing is more full for the expression of the Divine Majesty, nothing more clear as to the Unity of the Divine Power, since the Spirit has the same knowledge as the Son, Who is the witness and inseparable sharer of the Father’s secrets.