Window or mirror?

"I feel that it is healthier to look out at the world through a window than through a mirror. Otherwise, all you see is yourself and whatever is behind you." —Bill Withers, singer-songwriter

Undoubtedly it makes for a simpler and perhaps happier life to be all extroverted. But, unless you're mentally hopelessly myopic, I think that introspection is necessary for mental/spiritual development.
It is thought by many great thinkers that we see the world not so much as it is, as much as how *we* are. So if the world is not to our liking, the first thing we need to change is ourselves.