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Logic is like the sword–those who appeal to it shall perish by it.

— Samuel Butler, English Author

I mean, you could claim that anything’s real if the only basis for believing in it is that nobody’s proved it doesn’t exist!

— J.K.Rowling, Author

Nothing that is worth knowing can be taught.

— Oscar Wilde, Irish Poet and Playwright

Anger is a wind which blows out the lamp of the mind.

— Robert G. Ingersoll, American Lawyer

It is no small art to sleep: for that purpose you must keep awake all day.

— Friedrich Nietzsche, German philosopher

In a rational society we would want our presidents to be teachers. – In our actual society we insist they be cheerleaders.

— Steve Allen, Actor

The hour of departure has arrived, and we go our ways. I to die, and you to live. Which is better God only knows.

— Socrates, Classical Greek Philosopher 

Education consists mainly of what we have unlearned.

— Mark Twain, American Writer

What could an entirely rational being speak of with another entirely rational being?

— Emmanuel Levinas, French philosopher

Science is what we have learned about how to keep from fooling ourselves.

— Richard Feynman, American Theoretical Physicist
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