“The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals.”
Other Thomas Huxley Quotes
History warns us that it is the customary fate of new truths to begin as heresies and to end as superstitions.
Thomas Huxley 
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There is but one right, and the possibilities of wrong are infinite.
Thomas Huxley
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Try to learn something about everything and everything about something.
Thomas Huxley
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The ultimate court of appeal is observation and experiment... not authority.
Thomas Huxley
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Size is not grandeur, and territory does not make a nation.
Thomas Huxley
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