The Raven and the Swan
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.
of habit cannot alter nature.更改習慣，不能改變天性。