"Let other pens dwell on guilt and misery."

Austen, Jane on optimism   

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"Science knows only one commandment -- contribute to science."

Brecht, Bertolt on science   

"A man ceases to be a beginner in any given science and becomes a master in that science when he has learned that he is going to be a beginner all his life."

Collingwood, Robin G. on science   

"Evolution is not a force but a process. Not a cause but a law."

Morley, John on evolution   

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"Evolution has developed man to such a high degree that he builds zoos to keep his ancestors in cages."

Unknown, Source on evolution
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"Optimism. The doctrine or belief that everything is beautiful, including what is ugly."

Bierce, Ambrose on optimism
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"My sun sets to rise again."

Browning, Robert on optimism
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"I am an optimist. It does not seem too much use being anything else."

Churchill, Winston on optimism
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"A man who calls bullshit fertilizer."

Dane, Frank on optimism