IMO it should read ...Working hard requires willpower. Your willpower has been trained throughout your life by all the coincidences you've faced and their outcomes.
Your thought processes have been trained throughout your life by all the events you've faced and their outcomes. And yes, sometimes an event may be linked to a coincidence of some type.
I still don't know where you are going with this .... Are you still trying to say "coincidence (instead of luck)" will get you more places than hard work?