I've heard it said that one truly does not know a thing until they have shown and taught it to someone else.
I firmly believe in giving back, in many and frequent ways... not just often, but weekly and daily, in various ways... to home, community, church, city, county, state, country, and world.
10 to 20 percent (not that a number or quantity should ever be applied) of everything one does should be giving back to causes outside of one's own gain. Just do something.
One who is always on the take will ultimately end up with nothing of lasting value.