You become the average of the five people you spend the most time with.
Choose wisely.
Invest your time & energy with people that people that make you a better person.
I came across a list from Joe Pulizzi of the kinds of people you want around you.
Truth Teller – keeps you honest.
Superfan – reminds you your work matters.
Expert – further along than you.
Peer – in the arena with you.
Connector – opens doors.
While arguable, it is a good example of being intentional about the people with whom you spend time.