I agree that there are no coincidences and no mistakes.  There's a great line from the "Kungfu Panda" movie concerning that.   It can be difficult to understand why we must go through certain "lessons" like having to deal with an illness, for example.  These, lessons have been put forth for  our growth, for us to learn.  They are not random.  They are there to get us to the next level.  We either learn from them or we curse what we perceive as chaos.