"If I didn't believe it with my own mind, I never would have seen it."

Bard College graffiti, 1972.


Or: "If I believe it, I will see it -- wrong."
Or: "Context is all."
Or: "Don't believe much of what you see--it is more complicated!"

Try this:
http://blogs.discovermagazine.com/badastronomy/2009/06/24/the-blue-and-the-green/