One of the surprising discoveries of modern psychology is how easy it is to be ignorant of your own ignorance. You are normally oblivious of your own blind spot, and people are typically amazed to discover that we don't see colors in our peripheral vision. It seems as if we do, but we don't, as you can prove to yourself by wiggling colored cards at the edge of your vision-you'll see motion just fine but not be able to identify the color of the moving thing.
( Daniel C. Dennett )
[ Breaking the Spell: Religion ]
www.QuoteSweet.com