
Augustine of Hippo
Catena Aurea · Johannesevangelium 14
If ye love me, keep my commandments. And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
(Tract. lxxiv. 1) This is the Holy Ghost in the Trinity, Whom the Catholic faith professes to be consubstantial and coeternal with the Father and the Son.