Religions that teach brotherly love have been used as an excuse for persecution, and our profoundest scientific insight is made into a means of mass destruction.

To teach how to live without certainty and yet without being paralysed by hesitation is perhaps the chief thing that philosophy, in our age, can do for those who study it.

Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or ignorance.

I think we ought always to entertain our opinions with some measure of doubt. I shouldn't wish people dogmatically to believe any philosophy, not even mine.

Textbook science is beautiful! Textbook science is comprehensible, unlike mere fascinating words that can never be truly beautiful. Elementary science textbooks describe simple theories, and simplicity is the core of scientific beauty. Fascinating words have no power, nor yet any meaning, without the math.

Political liberty, the peace of a nation, and science itself are gifts for which Fate demands a heavy tax in blood!

Art does not, like science, set forth a permanent order of nature, the enduring skeleton of law. Two factors primarily determine its works: one is the idea in the mind of the artist, the other is his power of expression; and both these factors are extremely variable.

Every film requires a different process. You learn about these particular actors and the particular chemistry between these actors. Recognizing when you don't need to shoot a scene because it's going to be cut anyway.