No man can be a politician, except he be first a historian or a traveller; for except he can see what must be, or what may be, he is no politician.
Source: The Commonwealth of Oceana, 1656.
-- James Harrington, (Jan 7 1611-1677), English political philosopher; His major work, The Common-wealth of Oceana, 1656, was a restatement of Aristotle's theory of constitutional stability and revolution.