Unlike the natural scientist, who deals with matters that, whatever their origin, are not man-made or man-enacted, and that therefore can be observed, understood, and eventually even changed only through the most meticulous loyalty to factual, given reality, the historian, as well as the politician, deals with human affairs that owe their existence to man’s capacity for action, and that means to man’s relative freedom from things as they are. Men who act, to the extent that they feel themselves to be the masters of their own futures, will forever be tempted to make themselves masters of the past, too. Insofar as they have the appetite for action and are also in love with theories, they will hardly have the natural scientist’s patience to wait until theories and hypothetical explanations are verified or denied by facts. Instead, they will be tempted to fit their reality — which, after all, was man-made to begin with and thus could have been otherwise — into their theory, thereby mentally getting rid of its disconcerting contingency.

          Hanna Arendt