It is an error to imagine that evolution signifies a constant tendency to increased perfection. That process undoubtedly involves a constant remodelling of the organism in adaptation to new conditions; but it depends on the nature of those conditions whether the directions of the modifications effected shall be upward or downward.
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Agnosticism simply means that a man shall not say he knows or believes that for which he has no grounds for professing to believe.
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Every great advance in natural knowledge has involved the absolute rejection of authority.
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There is no greater mistake than the hasty conclusion that opinions are worthless because they are badly argued.
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The world makes up for all its follies and injustices by being damnably sentimental.
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God give me strength to face a fact though it slay me.
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I have no faith, very little hope, and as much charity as I can afford.
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Only one absolute certainty is possible to man, namely that at any given moment the feeling which he has exists.
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Make up your mind to act decidedly and take the consequences. No good is ever done in this world by hesitation.
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Only a scientific people can survive in a scientific future.
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It is not who is right, but what is right, that is of importance.
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Perhaps the most valuable result of all education is the ability to make yourself do the thing you have to do, when it ought to be done, whether you like it or not.
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Try to learn something about everything and everything about something.
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The deepest sin against the human mind is to believe things without evidence.
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Science comits suicide when it adopts a creed.
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The strongest man in the world is the man who stands alone.
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If a little knowledge is dangerous, where is the man who has so much as to be out of danger.
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