There is a mental sharpness that comes from being around good people.
And a meeting of minds can help people see their ideas with new clarity, refine them,
and shape them into brilliant insights. This requires discussion partners who can challenge each other and stimulate thought - people who focus on the idea without involving their egos in the discussion; people who know how to attack the thought and not the thinker. Two people who bring their ideas together can help each other become sharper.