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"Animals do not admire each other. A horse does not admire its companion."

"By a peculiar prerogative, not only each individual is making daily advances in the sciences, and may makes advances in morality, but all mankind together are making a continual progress in proportion as the universe grows older; so that the whole human race, during the course of so many ages, may be considered as one man, who never ceases to live and learn."

"Clarity of mind means clarity of passion, too; this is why a great and clear mind loves ardently and sees distinctly what it loves."

"Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth."

"For after all what is man in nature? A nothing in relation to infinity, all in relation to nothing, a central point between nothing and all and infinitely far from understanding either. The ends of things and their beginnings are impregnably concealed from him in an impenetrable secret. He is equally incapable of seeing the nothingness out of which he was drawn and the infinite in which he is engulfed."

"I have discovered that all human evil comes from this, man's being unable to sit still in a room."

"I have made this letter long because i have not the time to make it shorter."

"I have made this [letter] longer, because I have not had the time to make it shorter."

"I made this letter longer than usual because I lack the time to make it short."

"I maintain that, if everyone knew what others said about him, there would not be four friends in the world."