You are limited by your perceptions, both real and psychological I think a person only can respond to their perceptions, for that is what creates their reality. But it helps to know that there is something more out there, that what you don't know that you don't know. Makes sense?

Neurotics build castles in the sky, psychotics live in them, and psychiatrists collect the rent.

In other words, do not take yourself too seriously!

EDIT: I wonder if this would be my signature line?