Two comments from Epictetus
The chief task in life is simply this: to identify and separate matters so that I can clearly to myself which are externals not under my control, and which have to do with the choices I actually control. Where then do I look for good and evil? Not to uncontrollable externals, but within myself, to the choices that are my own...
. . .
These things don't go together. You must be a unified human being, either good or bad. You must diligently work either on your own reasoning or on things out of your control - take great care with the inside and not what's outside, which is to say, stand with the philosopher, or else with the mob!