On the Holy Spirit

St Ambrose of Milan (AD 339–397) · De Spiritu Sancto · PL 16, 703–816

1. Preface
2. Chapter I. The Spirit is the Lord and Power; and in this is not inferior to the Father and the Son
3. Chapter I. Not only were the prophets and apostles sent by the Spirit, but also the Son of God. This is proved from Isaiah and the evangelists, and it is explained why St. Luke wrote that the same Spirit descended like a dove upon Christ and abode upon Him. Next, after establishing this mission of Christ, the writer infers that the Son is sent by the Father and the Spirit, as the Spirit is by the Father and the Son

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St Thomas Aquinas, Summa theologiae 1265–1273 cites it 6 times

I, q. 8, a. 4 · I, q. 50, a. 1 · I-II, q. 68, a. 6 · III, q. 32, a. 2 · III, q. 66, a. 6

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Philip Schaff and Henry Wace (eds.), New York: Christian Literature Publishing Co., 1890-1900. Public domain: English translation first published 1885-1900 (Nicene and Post-Nicene Fathers, Second Series). Latin: Migne, Patrologia Latina (1844-1855), public domain; transcription from Corpus Corporum (University of Zurich).