Science

The man who can keep a secret may be wise, but he is not half as wise as the man with no secrets to keep.

– Edgar Watson Howe

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Almost every wise saying has an opposite one, no less wise, to balance it.

– George Santayana

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Choice, not chance, determines your destiny.

– Aristotle

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An idea that is not dangerous is unworthy of being called an idea at all.

– Oscar Wilde

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If I am not for myself, who will be for me? If I am not for others, what am I? And if not now, when?

– Rabbi Hillel

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Half the world is composed of people who have something to say and can’t, and the other half who have nothing to say and keep on saying it.

– Robert Frost

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The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.

– F. Scott Fitzgerald

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The universe is change; our life is what our thoughts make it.

– Marcus Aurelius

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Yesterday is not ours to recover, but tomorrow is ours to win or lose.

– Lyndon B. Johnson

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Progress is impossible without change, and those who cannot change their minds cannot change anything.

– George Bernard Shaw

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