Works of St. Anselm, tr. by Sidney Norton Deane, , at sacred-texts.com
He is greater than can be conceived.
THEREFORE, O Lord, thou art not only that than which a greater cannot be conceived, but thou art a being greater than can be conceived. For, since it can be conceived that there is such a being, if thou art not this very being, a greater than thou can be conceived. But this is impossible.