“You can die from someone else’s misery — emotional states are as infectious as diseases.”

— Robert Greene 

He also says to avoid the unhappy and unlucky.  

You become similar to the 5 people you are closest to, so who are you around the most? 

Are they happy?

Depressed? 

Negative? 

Positive? 

Optimistic? 

Hopeless? 

And what is your state of mind? 

Are you bringing value and energy to the tables you sit at? 

One of the best things we all can do is decide who we let into our lives – and to be extremely selective about it – since we become similar to the people we hang out with.