Setbacks, failures, fears, are they useful?

One day, an opening appeared in a cocoon. a
   man sat and watched the butterfly emerging fight
   for hours to put out his shelter and force the
   small hole to grow. But soon it seemed to man
   that the insect was not progressing.

       He had gone as far as he could, but it
   stir.

       So the man took a pair of scissors and cut out
   Gently cocoon to help the butterfly out.
   It emerged easily. But he had a frail body
   and its crumpled wings were atrophied.

"No problem, it will grow" says the man.
   And he continued to watch the butterfly hoping it
   spreads its wings to fly.

       But that never happened. The butterfly spent the rest
   its life crawling around on his little body, unable
   to use its wings stunted.

       What man in his goodness hasty, had not
   understood is that the cocoon is too tight a ruse of
   Nature to force the tie to the drilling and
   cause its wings ... Only on this condition, it can
   fly.

...............................................

Sometimes our fears, our failures, our setbacks are
   precisely what we need. If nature allowed that
   go through life without ever encountering any obstacle, it
   weaken us, we would be too similar to the butterfly
   quickly comes to the ease which has clipped the wings.

       Freedom is hard won ... But it does not fly
   without training a minimum!

"We need the desire to be irritated by obstacles.
The man who has nothing to be desired is certainly most unfortunate
that the sufferer. "