凡其为此物也,无不加用而为者,是故用财不费,民德不劳,其兴利多矣。
凡是圣人制造的这些东西,无一不是有益于实用才去做的,所以使用财物不浪费,民众能够不劳苦,他兴起的利益太多了。 
Writing is like sex. First you do it for love, then you do it for your friends, and then you do it for money.
He who is not satisfied with a little, is satisfied with nothing.