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

p. 125

Book IX.

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That a kind of trinity exists in man, who is the image of God, viz. the mind, and the knowledge wherewith the mind knows itself, and the love wherewith it loves both itself and its own knowledge; and these three are shown to be mutually equal, and of one essence.