Aesop

The Shepherd and the Wolf
A shepherd once found the whelp of a Wolf and brought it up, and after read more

The Shepherd and the Wolf
A shepherd once found the whelp of a Wolf and brought it up, and after a while taught it to steal lambs from the neighboring flocks. The Wolf, having shown himself an apt pupil, said to the Shepherd, Since you have taught me to steal, you must keep a sharp lookout, or you will lose some of your own flock.

The Aethiop
The purchaser of a black servant was persuaded that the color of his skin arose from dirt contracted read more

The Aethiop
The purchaser of a black servant was persuaded that the color of his skin arose from dirt contracted through the neglect of his former masters. On bringing him home he resorted to every means of cleaning, and subjected the man to incessant scrubbings. The servant caught a severe cold, but he never changed his color or complexion.
What's bred in the bone will stick to the flesh.

The Raven and the Swan
A raven saw a Swan and desired to secure for himself the same beautiful plumage. read more

The Raven and the Swan
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.