Cocoons are nature's way of protecting the metamorphous of a butterfly however we tend to use cocoons in a different way. Not for growing into something new and greater than the old self but to protect ourselves from harm.
Every hurt and disappointment that we feel deeply creates a new strand of protection around us to prevent it from happening again. Some might call it a hardening of the heart. It is natural to try and avoid being hurt but at what cost.
When we wrap ourselves in a protective cocoon we lose the ability to feel someone else or ourselves reaching out. When we feel something touch our cocoon it brings to mind our fear of being hurt again and so we reject it and push it away. We will not allow anyone or anything to be that close to us again.
Over time the cocoon instead of a nurturing stage becomes a hardened coffin of our feelings. We are frozen in our personal growth. To grow we need to take the chance of being hurt just like we learned how to walk; with the fear of being hurt but determined to continue until it no longer pains us.
Only by working through our fears can we grow.