Hi Randy: I have this book The teachings of the Catholic Church By John R. Willis, SJ Ignatius press on page 189, 417 (1662) of St. Augustine: it says: if, therefore, that also which is given has Him for a Beginning by whom it is given, since it has received from no other source that which proceeds from Him; it must be admitted that the Father and the Son are a Beginning of the Holy Spirit, not two Beginnings but as the Father and Son are one God, and one Creator, and one Lord relatively to the creature, so are they one Beginning relatively to the Holy Spirit. But the Father, the Son, and the Holy Spirit is one Beginning in respect to the creature, as also one Creator and one God. On the trinity, BK,5 Chap.14 ML42,921 NPNFIII,95
418 (1839) Why, then, should we not believe that the Holy Spirit proceeds also from the Son, seeing that He is likewise the Spirit of the Son? For did He not so proceed, He could not, when showing Himself to His diciples after the resurrection, have breathed on upon them, and said" Receive the Holy Spirit" (JN.20:22). For what else was signified by such a breathing upon them, but that from Him also the Holy Spirit proceeds? " There is much more but thought that this might help in gaining some little understandng that the Holy Spirit proceeds from both the Father and the Son and not just from the Father only. On the Gosple of St. John Tr.99:7 ML 35, 1889 NPNF VII 383-384