George Edward Moore,
Principia Ethica — Chapter I
(1903)
“ We should not get any very clear notion about things, which are yellow—we should not get very far with our science, if we were bound to hold that everything which was yellow, meant exactly the same thing as yellow. We should find we had to hold that an orange was exactly the same thing as a stool, a piece of paper, a lemon, anything you like. We could prove any number of absurdities; but should we be the nearer to the truth? Why, then, should it be different with ‘good’? Why, if good is good and indefinable, should I be held to deny that pleasure is good? ”
