You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.

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

An expert is a man who has made all the mistakes which can be made, in a narrow field.

In our description of nature the purpose is not to disclose the real essence of the phenomena but only to track down, so far as it is possible, relations between the manifold aspects of our experience.

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.

Sometimes the child in one behaves a certain way and the rest of oneself follows behind, slowly shaking its head.