A bird that voluntarily clips its wings will never grow flight feathers. Even if it grows some deformed feathers, the bird's heart will only be tied to the cage that it does not want to leave.
◎Zha Shou, attack to death, BE
◎The ignorant and infatuated male concubine attacks vs. The gentle and ruthless emperor suffers
Purpose: Birds whose wings are voluntarily clipped will never grow flight feathers again