a raven saw a swan and desired to secure for himself the same beautiful plumage. supposing that the swan''s splendid white color arose from his washing in the water in which he swam, the raven left the altars in the neighborhood where he picked up his living, and took up residence in the lakes and pools. but cleansing his feathers as often as he would, he could not change their color, while through want of food he perished.

change of habit cannot alter nature.

乌鸦梦想自己也能拥有和天鹅一样洁白美丽的羽毛。【尘宵小说网】他猜想，天鹅的羽毛之所以那么洁白，一定是常常洗澡的原因。于是，他决定离开赖以生存的祭坛，搬到江湖边居住。他每天清洗自己的羽毛，可是不仅羽毛没有洗白，反而因为缺少食物而饿死了。

天生的东西是不会随生活方式的变化而改变的。