Nicene and Post-Nicene Fathers, Vol. III:
Doctrinal Treatises of St. Augustin: Book II

p. 37

Book II.

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Augustin pursues his defense of the equality of the Trinity; and in treating of the sending of the Son and of the Holy Spirit, and of the various appearances of God, demonstrates that He who is sent is not therefore less than He who sends, because the one has sent, the other has been sent; but that the Trinity, being in all things equal, and alike in its own nature unchangeable and invisible and omnipresent, works indivisibly in each sending or appearance.