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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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" I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection. "

" I have tried lately to read Shakespeare, and found it so intolerably dull that it nauseated me. "

" 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. "

" The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic. "

" Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science. "

" The very essence of instinct is that it's followed independently of reason. "

" A moral being is one who is capable of reflecting on his past actions and their motives - of approving of some and disapproving of others. "

" I cannot persuade myself that a beneficent and omnipotent God would have designedly created parasitic wasps with the express intention of their feeding within the living bodies of Caterpillars. "

" What a book a devil's chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature! "

" I love fools' experiments. I am always making them. "

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

" I am turned into a sort of machine for observing facts and grinding out conclusions. "

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

" To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact. "

" Man tends to increase at a greater rate than his means of subsistence. "

" An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men. "

" We can allow satellites, planets, suns, universe, nay whole systems of universes, to be governed by laws, but the smallest insect, we wish to be created at once by special act. "

" We must, however, acknowledge, as it seems to me, that man with all his noble qualities... still bears in his bodily frame the indelible stamp of his lowly origin. "

" If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin. "

" I have steadily endeavoured to keep my mind free so as to give up any hypothesis, however much beloved (and I cannot resist forming one on every subject), as soon as facts are shown to be opposed to it. "

" On the ordinary view of each species having been independently created, we gain no scientific explanation. "

" It is a cursed evil to any man to become as absorbed in any subject as I am in mine. "

" At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate, and replace the savage races throughout the world. "

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

" Man is descended from a hairy, tailed quadruped, probably arboreal in its habits. "

" My mind seems to have become a kind of machine for grinding general laws out of large collections of facts. "

" A scientific man ought to have no wishes, no affections, - a mere heart of stone. "