Insight about the life of caterpillar

There was a story about a child who saw a pupa struggling inside the cocoon. The child felt pity on it, so she tore the cocoon to help the pupa comes out. When it was done, it could not fly because it was not fully develop. Instead, it died . We know that before a caterpillar turns into a beautiful butterfly, it has to pass through a stage where it is called pupa. In this stage, the caterpillar is being wrapped up by a cocoon. In there, pupa develop its wings. We cannot imagine the struggle of this little creature inside the cocoon but this is how it should be as a preparation when it comes out and explore the world outside. Likewise, man's life is the same. We need to undergo struggles and bitterness in life that would make us a better person.