" It takes years for the moth to evolve from an egg into an adult," he said. "In its final stage the caterpillar spins a cocoon and then it dissolves completely until it's just liquid, then it transforms. It becomes something else entirely. A huge emperor moth. But it's not that easy. Before it can live as a moth it has to fight it's way out of the cocoon. Not all make it."
"They would if I was there," said Ruth, taking another gulp.
Gabriel was uncharacteristically silent.
"What? What is it?" demanded Ruth.
"They need to fight their way out of the cocoon. It builds their wings and muscles. It's the struggle that saves them. Without it they're crippled. If you help an emperor moth, you kill it. "

― Louise Penny , The Cruelest Month (Chief Inspector Armand Gamache, #3)