It is a cursed evil to any man to become as absorbed in any subject as I am in mine.
I am turned into a sort of machine for observing facts and grinding out conclusions.
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.
A scientific man ought to have no wishes, no affections, - a mere heart of stone.
I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection.
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.
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.
An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.
A man's friendships are one of the best measures of his worth.
A man who dares to waste one hour of time has not discovered the value of life.
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