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No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.

Our knowledge can only be finite, while our ignorance must necessarily be infinite.

We are social creatures to the inmost centre of our being. The notion that one can begin anything at all from scratch, free from the past, or unindebted to others, could not conceivably be more wrong.

We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.

Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.

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