Introduction to the Three Books of St. Ambrose on the Holy Spirit. The three books on the Holy Spirit are, as St. Ambrose says himself, a sequel to those on the Faith, and the two treatises together have been sometimes quoted as if one, with the title, De Trinitate. But we see from Gratian's letter to St. Ambrose, and from the reply, that each treatise is separate, and theDe Spiritu Sancto was written some years later, a.d. 381.
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