What experience supplies is of a mingled tissue, and the choosing mind has much to reject before it can get together the materials of a theory.
经验提供的是交织混杂的素材;善于选择的心智,必须舍弃许多,才能凑齐构成一种理论的材料。
— Robert Louis Stevenson · Virginibus Puerisque, and Other Papers · Pan’s Pipes —