Fable 136 - The Kite Who Neighed

The kite once had a different voice, a voice which was high-pitched and shrill. But one day he heard a horse neighing beautifully,
and he longed to imitate it. Try as he might, he simply couldn’t attain the same voice as the horse, and at the same time he lost his own.
This is why he has neither his own voice nor that of the horse.

Jealous people envy qualities which they don’t possess and lose their own.