Most experiences in our lives that seemed difficult at the time become valuable lesson for the future...

Everything comes and goes, sometimes it stays for some time, sometimes for long time, but finally always leaves us, the basis is, what you've got after it leaves.
  Evetyrhing in life , even stupid little things influence us as personalities, life sculpts personalities from us, and we cant judge anyone, because we never know their way and their life.
  The things that hurt us have bigger influence and effect on us, than things which make us happy.
   when child falls down and gets hurt next time he/she is more cautious, because they are afraid of making same mistake and getting hurt.When we become adults we do the same thing, the things that hurt us make us more cautious.
   And as everything comes and goes nothing lasts forever, and if it is difficult time it wont last forever, but  offensively is that we learn better on our own mistakes and even if you know someone's experience, and you know you're going to make same mistake, you do it anyway, and finally it changes us, someone to better side, someone to worse side and someone becomes just smarter and wiser...