“The theory must not contradict empirical facts,”

“Everything must be taken into account. If the fact will not fit the theory---let the theory go.”

“[Modern scientific] theories can necessarily never be more than hypothetical, since their starting-point is wholly empirical, for facts in themselves are always susceptible of diverse explanations and so never have been and never will be able to guarantee the truth of any theory.”

“Somewhere out there is a theory that would explain my empirical observations, and this theory has yet to be discovered. Mathematics thrives on such mysteries.”

“Sooner or later, all conspiracy theories, no matter how outlandish, must eventually rest a certain set of facts. And facts can be checked.”

“When religion talks about our aspirations and our sense of morality, I do not believe that science can contradict it. However, when religion contradicts science on matters of fact, religion must yield.”