Albert Einstein (2016). “The Albert Einstein Collection: Essays in Humanism, The Theory of Relativity, and The World As I See It”, p.11, Open Road Media
'Hansard' 17 March 1845, col. 1028. Bagehot, quoting Disraeli in 'The English Constitution' (1867) 'The House of Lords', elaborated on the theme with the words 'so much did the ideas of its "head" differ from the sensations of its "tail".'