The caterpillar is not sure it is going to be a butterfly. Each part of its death and rebirth in the cocoon must be experienced.
The story is told of a man who noticed a cocoon on a bush in his yard. As he started to remove it from the bush and throw it away, he noticed the end was opening and a butterfly was struggling to escape. In an effort to help the emerging butterfly, he took it inside and carefully cut the cocoon away with a razor blade. The butterfly feebly crawled away from the open cocoon and within a few hours, died. It needed the strength it would have gained from the struggle to free itself in order to survive in the outside world.