The more action you take to control that which you can control creates a place where the things you can’t control fall in your favour.
The problem that exists is that we think we can control things we have no agency over and we don’t know the extent of the things we can control.
Here’s one to be going on with:
You CAN’T control other people, how they react or what they think
You CAN control yourself, how you react and the things you think, feel and believe.