Thinner, de Stephen King

“I believe it,” Ginelli said almost abruptly.
“Yeah? What happened to the guy who only believed in guns and money?”
Ginelli smiled, then laughed. “I told you that when you called that time, didn’t I?”
“Yeah”
The smile faded. “Well, there’s one more thing I believe in, William. I believe in what I see. That’s why I’m a relatively rich man. That’s also why I am a living man. Most people, they don’t believe in what they see.”
“No?”
“No. Not unless it goes along with what they already believe. (…) The definition of an asshole is a guy who doesn’t believe what he’s seeing. And you can quote me.”