清朝初年尚书魏象枢,著有《庸斋闲话》,其中有一则把水与油比喻君子小人的格言:水,君子也。其性凉,其质白,其味纯,其为用也,可以浣不洁者而使洁。即沸汤中投以油,亦自分别而不相混,诚哉君子也。油,小人也。其性滑,其味浓,其为用也,可以污洁者而使不洁。倘滚油中投以水,必致博激而不相容,诚哉小人也。 In the early years of the Qing Dynasty, Wei Xiangshu was the author of the book entitled “Free Gossip”, in which one of the gentlemen of water and oil compared gentleman gentlemen with water and gentleman. Its cool, its white, its taste pure, it is also used, you can clean people who are not clean. That is, the boiling soup vote in oil, but also from the different but not mixed, honest and dear gentleman too. Oil, villain also. Its sexual slippery, its flavor is thick, its use is also, can make unclean cleanser. If the cast vote in the water, will be excited and incompatible, honest little villain too.