According to Anselm, archbishop of Canterbury from 1093 to 1109, the existence of God is proven from his being ‘that-than-which-nothing-greater-can-be-thought.’ He sets forth this proof in his work, the Proslogion, written in 1077-78.[1] I recently had the joy of reading it in Anselm, Brian Davies, and G. R. Evans, The Major Works, Oxford World’s Classics