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The joy of discovery is certainly the liveliest that the mind of man can ever feel.

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You cannot teach a man anything; you can only help him find it within himself.

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Better be wise by the misfortunes of others than by your own.

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To surrender to ignorance and call it God has always been premature, and it remains premature today.

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If a man cannot choose, he ceases to be a man.

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He who fights monsters should look into it that he himself does not become a monster. When you gaze long into the Abyss, the Abyss also gazes into you.

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Four things come not back -- the spoken word, the sped arrow, the past life, and the neglected opportunity.

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Be humble for you are made of earth. Be noble for you are made of stars.

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I cannot conceive otherwise than that He, the Infinite Father, expects or requires no worship or praise from us, but that He is even infinitely above it.

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Gods are fragile things; they may be killed by a whiff of science or a dose of common sense.

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