"It is a great pity that human beings cannot find all of their satisfaction in scientific contemplativeness."

"Truth and clarity are complementary."

"How wonderful that we have met with a paradox. Now we have some hope of making progress."

"Every sentence I utter must be understood not as an affirmation, but as a question."

"Anyone who is not shocked by quantum theory has not understood it."

"Some subjects are so serious that one can only joke about them."

"We are all agreed that your theory is crazy. The question that divides us is whether it is crazy enough to have a cha…"

"Physics is to be regarded not so much as the study of something a priori given, but rather as the development of meth…"

"Two sorts of truth: profound truths recognized by the fact that the opposite is also a profound truth, in contrast to…"

"It is not enough to be wrong, one must also be polite."