Pleasures are more beneficial than duties because, like the quality of mercy, they are not strained, and they are twice blest.
快乐比义务更能造福于人,因为它像慈悲一样,出于自愿,并使双方同蒙其福。
— Robert Louis Stevenson · Virginibus Puerisque, and Other Papers · An Apology for Idlers —