When speaking of a "body of knowledge" or of "the results of research," e.g., we tacitly assign the same cognitive status to inherited knowledge and to independently acquired knowledge. To counteract this tendency a special effort is required to transform inherited knowledge into genuine knowledge by revitalizing its original discovery, and to discriminate between the genuine and the spurious elements of what claims to be inherited knowledge.
Leo StraussTo avert the danger [posed by theory] to life, Nietzsche could choose one of two ways: he could insist on the strictly esoteric character of the theoretical analysis of life - that is, restore the Platonic notion of the noble delusion - or else he could deny the possibility of theory proper and so conceive of thought as essentially subservient to, or dependent on, life or fate... If not Nietzsche himself, at any rate his successors [Heidegger] adopted the second alternative.
Leo StraussMen must always have distinguished (e.g. in judicial matters) between hearsay and seeing with one's own eyes and have preferred what one has seen to what he has merely heard from others. But the use of this distinction was originally limited to particular or subordinate matters. As regards the most weighty matters the first things and the right way the only source of knowledge was hearsay.
Leo StraussEven by proving that a certain view is indispensable for living well, one proves merely that the view in question is a salutary myth: one does not prove it to be true.
Leo StraussOur understanding of the thought of the past is liable to be the more adequate, the less the historian is convinced of the superiority of his own point of view, or the more he is prepared to admit the possibility that he may have to learn something, not merely about the thinkers of the past, but from them.
Leo Strauss