You stop trying to control or even understand every little thing ... you do your best (by using common sense and research when necessary) to control and understand what really matters (to you) and you relax and enjoy the life you have created.So, what do you do ? Are you going to learn enough to diagnose and treat cancer ? To repair a car ? To plan policies for a government ? To create a just legal system ? To decide every question on every issue ? No one lives long enough to even try.