Work on the things you have influence on ...

 Stoic approach is to make sure we know how to divide things we should plan and focus working on. 

The main division line is based on "Control", "Influence". Specificaly to make sure we know what and how we can control and influence... Epikret implemented  three groups 

1. Complete Out of control

2. Complete in Control

3. Middle control 

We should be focused on no 2 & 3 - wherever we do not have a shred of control we should be able to let it go - as our efforts to put it under control are futile and would not bring us any good. In contrary it would only do us harm - as we would be frustrated with the zero outcome of our actions. 

Think about all the time & actions you took to work on something that is just not worth your time - sometimes it would be better to sleep during that time - as it would be more ... efficient/effective.

The initial thing is to make sure we know the difference and we are able to walk away from the fight - which we cannot win in the first place.

.... Let it go...