It's mostly derived from ancient Stoics and Taoist thinking. Think about death and it's inevitability. Since it is inevitable there is little value in fearing

It's mostly derived from ancient Stoics and Taoist thinking. Think about death and it's inevitability. Since it is inevitable there is little value in fearing it. Or think about trying to change other people's minds. You have little/no control of their thinking. As long as you are enjoying the process of discussion then great, discuss for its own sake. But being stressed about it makes no sense. You have quite a lot of control of your own habits, circumstances and growth -- and by focusing on them the world will be a better place than if you focused on things you had no control over. There will always be pain and evil as long as there is joy and life, so don't worry too much about fixing that.