The impulse to understand, and not merely to know and to act, is an impulse characteristic of man and apparently not shared by other animals. I am not concerned here with the origin and nature of this impulse, but with its implications that there is something to be understood and that understanding is not reducible to knowledge and action.
J.G. Bennett (1963) "General Systematics" in: Systematics (1963) Vol 1., no 1. p. 5; cited on The Primer Project on isss.org, 2007.07.03