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

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

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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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I learned long ago, never to wrestle with a pig. You get dirty, and besides, the pig likes 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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Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.

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The person I miss most is the one I could have been.

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War does not decide who is right but who is left.

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

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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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