He Recognises the Trinity in the First Two Verses of Genesis.

6. Behold now, the Trinity appears unto me in an enigma, which Thou, O my God, art, since Thou, O Father, in the Beginning of our wisdom,—Which is Thy Wisdom, born of Thyself, equal and co-eternal unto Thee,—that is, in Thy Son, hast created heaven and earth. Many things have we said of the heaven of heavens, and of the earth invisible and formless, and of the darksome deep, in reference to the wandering defects of its spiritual deformity, were it not converted unto Him from whom was its life, such as it was, and by His enlightening became a beauteous life, and the heaven of that heaven which was afterwards set between water and water. And under the name of God, I now held the Father, who made these things; and under the name of the Beginning, the Son, in whom He made these things; and believing, as I did, that my God was the Trinity, I sought further in His holy words, and behold, Thy Spirit was borne over the waters. Behold the Trinity, O my God, Father, Son, and Holy Ghost,—the Creator of all creation.

Conf 15.6.1