I believe that when we arrive here our card is marked, we have a set time to die. I don't believe this can be changed by anything, it may appear to us that someone has been 'saved' from certain death and how lucky they were, when in fact they weren't meant to die at that time at all, and being saved was part of something bigger and unknown to us, perhaps we learn from it such as advancements in medicine etc, this includes those who are brought back from the dead and then go on to lead fuller lives because of their experience.
What are your thoughts?