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No statement should be believed because it is made by an authority.

You should never assume about someone.

Euclid taught me that without assumptions there is no proof. Therefore, in any argument, examine the assumptions.

Absence of proof is not proof of absence.

With impressive proof on all sides of magnificent progress, no one can rightly deny the fundamental correctness of our economic system.

It's sad that we never get trained to leave assumptions behind.

The plain fact is that there are no conclusions.