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To him who looks upon the world rationally, the world in its turn presents a rational aspect. The relation is mutual.

— Georg W.H. Hegel, German philosopher

I think that we must find some way to get more common sense, more rationality, in our decisions and less emotion.

— David Packard, Co- founder of HP

Every cause produces more than one effect.

— Herbert Spencer, English Philosopher

Give a girl an education and introduce her properly into the world, and ten to one but she has the means of settling well, without further expense to anybody.

— Jane Austen, English Novelist

An expert is a person who has made all the mistakes that can be made in a very narrow field.

— Niels Bohr, Danish physicist

You can buy my time and effort, but you have to earn my dedication.

— Aristotle, Greek Philosopher

A concept is a brick. It can be used to build a courthouse of reason. Or it can be thrown through the window.

— Gilles Deleuze, French Philosopher

Educating the mind without educating the heart is no education at all.

— Aristotle, Greek Philosopher

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

— Richard Feynman, American Theoretical Physicist

The smallest minority on earth is the individual. Those who deny individual rights cannot claim to be defenders of minorities.

— Ayn Rand, Russian-American Novelist
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