If we allow ourselves to focus on variables outside of our control, we invariably take the focus from things we can change. In other words: When you think about things outside of your control, you take resources away from things that can make your life better.
You have a finite amount of time and if you focus on that you cannot change, you steal time away from actions that bring change to your life.
IF: You focus on what you cannot change
THEN: you steal time away, from actions that bring change.As you focus on what you control, your circle-of-influence (what you control), increases. Inversely if you focus on what you cannot change your circle of influence decreases.