UnrealWarCheek: On the sub topic of quotes...
"For those who believe, no proof is necessary. For those who don't believe, no proof is possible." - This quote by Stuart Chase is one of my favourite.
That quote works for me to a point. But I think the "no proof is possible" thing is a bit rough on people who employ critical thinking.
Being skeptical isn't about just contrary and cynical - the point of skepticism is to open to considering new ideas and updating beliefs and theories, being open minded.