A favorite quote from Carol Dweck, author of Mindset: the New Psychology of Success:
"It's tempting to create a world in which we're perfect. (Ah, I remember that feeling from grade school.) we can choose partners, make friends, hire people who make us feel faultless. But think about it - do you want to never grow? Next time you're tempted to surround yourself with worshipers, go to church. In the rest of your life, seek constructive criticism."