“To know, you just have to know. To believe, you have to make others believe.”

Billy the Kid's comment to a Las Vegas Gazette reporter (December, 1880)
About Billy the Kid website http://www.aboutbillythekid.com/index.html

Source: On Writing: A Memoir of the Craft

she cried. “He will fire long before you can finish one of those fine sentences!”
Source: Tourmalin's Time Cheques (1885), Chapter 8, “Paid in His Own Coin”

Source: Illusions: The Adventures of a Reluctant Messiah

The Time of the Hero (1963)

Quoted in German Mystical Writings: Hildegard of Bingen, Meister Eckhart, Jacob Boehme, and Others (1991), edited by Karen J. Campbell

Edie : American Girl (1982)
Context: Everything that happened to me has been a paradox for life. The very things that I should have done would have been the trap. The very things I might have given into, that demanded, that said, this is your life. I mean, this is your only way to survive, are the things I found hardest to end. 'Cause I believed in something else. You have to work like mad to make people understand... Even if I don't make it, you know, I really insist on believing, and then I fall off the edge because there's nobody else to follow it. And I would just fall off the edge.