An old story:
A man stumbled upon a cocoon of an emperor moth and took it home to witness its transformation.
One day, a small opening appeared. The man watched as the moth began to struggle to force its body through the tiny crack. A few hours went by as the moth wriggled, fought, and pushed—but it couldn’t seem to break through the tiny crack.
Feeling bad, the man carefully cracked the cocoon and peeled away the pieces to open up a path for the moth.
It quickly emerged, but something was wrong. Its body was swollen and its wings weren’t working. Days went by without progress. The moth never flew.
Only later did the man learn what had happened: The painful struggle to break free of the cocoon forces fluid from the moth’s body and wings. Without that struggle, the fluid was never drained and the moth was permanently incapacitated.