There are so many things in life to get angry about. And there are many things in the world to worry about. You can get riled up about anything in life. But that doesn’t mean that getting annoyed is the best thing to do.
So, the advice is to resist getting stirred up about things that actually don’t matter. And for the things that do actually matter, you still may not need to get stirred up. Sometimes it doesn’t matter. Sometimes things will just work without the emotional outpouring.
Let people believe what they want. Let things happen without getting angry at everything. Deal with things with a calm, cool demeanor.