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A man who dares to waste one hour of time has not discovered the value of life.

Animals, whom we have made our slaves, we do not like to consider our equal.

False facts are highly injurious to the progress of science, for they often endure long; but false views, if supported by some evidence, do little harm, for every one takes a salutary pleasure in proving their falseness.

How paramount the future is to the present when one is surrounded by children.

It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change.