A wolf, while on his rambles, came across a field of oats. Since he could not eat them, he was about to leave when a horse approached.
"Look," said the wolf, "here is a fine field of oats. For your sake, I have left it untouched, and I shall greatly enjoy the sound of your teeth munching the ripe grain."
But the horse replied, "If wolves could eat oats, my fine friend, you would hardly have indulged your ears at the cost of your belly."
Moral: There is no virtue in giving to others what is useless to oneself.