"If you're the smartest person you know, it's time to know some new people.
If you're the most successful person on your street Ken, today I encourage you to find a new street. [I'm only partly joking on his one]."
So they always tell you. "You need to constantly seek out people more successful than you are and therefore you must not be stuck with your usual group of friends if you want phenomenally breakthrough success." Maybe there is some truth in it.
Yet, we must not take it too literally, too religiously and too far. If you can be so certain that you are already the smartest person (among your usual group of friends) you know, don't you think that there could be a possibility that you still have a lot of catching up to do in smartness terms???