Works of St. Anselm, tr. by Sidney Norton Deane, [1903], at sacred-texts.com
This love is identical with the supreme Spirit, and yet it is itself with the Father and the Son one spirit.
BUT, what can be equal to the supreme Spirit, except the supreme Spirit? That love is, then, the supreme Spirit. Hence, if no creature, that is, if nothing other than the supreme Spirit, the Father and the Son, ever existed; nevertheless, Father and Son would love themselves and one another.
It therefore follows that this love is nothing else than what the Father and the Son are, which is the supreme Being. But, since there cannot be more than one supreme Being, what inference can be more necessary than that Father and Son and the love of both are one supreme Being? Therefore, this love is p. 114 supreme Wisdom, supreme Truth, the supreme Good, and whatsoever can be attributed to the substance the supreme Spirit.