There are trivial truths and there are great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true. - Niels Bohr

An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field.

Physics is to be regarded not so much as the study of something a priori given, but rather as the development of methods of ordering and surveying human experience. In this respect our task must be to account for such experience in a manner independent of individual subjective judgement and therefore objective in the sense that it can be unambiguously communicated in ordinary human language.

We must be clear that when it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images and establishing mental connections.