The reasonable man adapts himself to the world; the unreasonable one persists to adapt the world to himself. Therefore all progress depends on the unreasonable man.

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Success does not consist in never making mistakes but in never making the same one a second time.

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A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.

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The longer I live, the more convinced am I that this planet is used by other planets as a lunatic asylum.

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Beware of false knowledge; it is more dangerous than ignorance.

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People who say it cannot be done should not interrupt those who are doing it.

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Life contains but two tragedies. One is not to get your heart's desire; the other is to get it.

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I learned long ago, never to wrestle with a pig. You get dirty, and besides, the pig likes it.

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Experience fails to teach where there is no desire to learn.

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We don't stop playing because we grow old; we grow old because we stop playing.

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