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If Man be separated by no greater structural barrier from the brutes than they are from one another—then it seems to follow that if any process of physical causation can be discovered by which the genera and families of ordinary animals have been produced, that process of causation is amply sufficient to account for the origin of Man.

— Thomas Henry Huxley Evidence as to Man's Place in Nature (1863)

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More quotes by Thomas Henry Huxley

The man of science has learned to believe in justification, not by faith, but by verification.

On the advisableness of improving natural knowledge (1866)

Life is too short to occupy oneself with the slaying of the slain more than once.

The method of scientific investigation is nothing but the expression of the necessary mode of working of the human mind.

Our Knowledge of the Causes of the Phenomena of Organic Nature (1863)

Try to learn something about everything and everything about something.

The great end of life is not knowledge but action.

Technical Education (1877)

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Quote text and notes from Wikiquote: Thomas Henry Huxley (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.