One can bring no greater reproach against a man than to say that he does not set sufficient value upon pleasure, and there is no greater sign of a fool than the thinking that he can tell at once and easily what it is that pleases him. To know this is not easy, and how to extend our knowledge of it is the highest and the most neglected of all arts and branches of education.

Samuel Butler, The Note-Books of Samuel Butler, London, 1912, ‘On Knowing what Gives us Pleasure’, sect. 1