It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change.
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I am not the least afraid to die.
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It is a cursed evil to any man to become as absorbed in any subject as I am in mine.
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A man's friendships are one of the best measures of his worth.
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I love fools experiments. I am always making them.
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What a book a devil's chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!
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The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.
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A man who dares to waste one hour of his life has not discovered the value of life.
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