S.A. Bent, comp. Familiar Short Sayings of Great Men. 1887.
John Scotus Erigena
[A philosopher, born in Ireland; passed most of his life in France, where he was celebrated for classical learning and subtlety in scholastic disputation; sought refuge from church difficulties with Alfred the Great; died about 875 A.D.]
When Charles the Bald of France, who sat opposite to him at dinner, asked Scotus what the difference was between a Scot and a sot (quid intersit inter Scotum et solum), he replied, The table only (Mensa tantum).