My plan to save the planet keeps bumping into the seen and the unseen. Almost no one would argue with the great lesson of the stoic philosopher Epictetus. The world divides into that which depends on me, and that which does not. For the stoics, the lesson was that I shouldn’t worry about that which I can’t control. Instead I should focus on making good choices over those things and events I can control. Right there is where the trouble begins.