It has been said that no one ever understood the question which is known by the name of the Schleswig-Holstein question — that the only person who got nearly to understand it was a German professor, and that it had driven him mad.

Speech at the annual dinner connected with the Christmas Horsham Cattle Show, held in the Black Horse Inn, Horsham, on 9 December 1863; quoted in "MR. SEYMOUR FITZGERALD, M.P., AND MR. CAVE, M.P., ON FOREIGN AFFAIRS." 11 December 1863 Evening Standard (London) p. 2 col. 2

Compare Henry Temple, 3rd Viscount Palmerston#Misattributed