On the Holy Spirit — Source paragraphs and footnotes

Date uncertain | Ambrose of Milan

27. So, then, the world had not eternal life, because it had not received the Spirit; for where the Spirit is, there is eternal life; for the Spirit Himself it is Who effects eternal life. Wherefore I wonder why the Arians stir the question as to the only true God. For as it is eternal life to know the only true God, so, too, is it eternal life to know Jesus Christ; so, again, it is eternal life to know the Holy Spirit, Whom, as also the Father, the world does not see, and, as also the Son, does not know. But he who is not of this world has eternal life, and the Spirit, Who is the Light of eternal life, remains with him for ever.

Complete source paragraph · On the Holy Spirit, Chapter III., source paragraph 4 · Original source

Date uncertain | Ambrose of Milan

28. If the knowledge of the only true God confers the same benefit as the knowledge of the Son and of the Spirit, why do you sever the Son and the Spirit from the honour of the true God, when you do not sever Him from conferring the benefit? For of necessity you must either believe that this is the greatest gift of the only true Godhead, and will confess the only true Godhead as of the Father, so also of the Son and of the Holy Spirit; or if you say that he, too, can give life eternal who is not true God, it will happen that you derogate rather from the Father, Whose work you do not consider to be the chief work of the only true Godhead, but one to be compared to the work of a creature.

Complete source paragraph · On the Holy Spirit, Chapter III., source paragraph 5 · Original source