“The big problem is that people don't believe a revolution is possible, and it is not possible precisely because they do not believe it is possible.”
Interview from primitivism.com http://www.primitivism.com/kaczynski.htm
Interviews
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Theodore Kaczynski 49
American domestic terrorist, mathematician and anarchist 1942Related quotes
“If you believe that it is possible to break, believe it is also possible to fix.”
אם אתה מאמין שיכולים לקלקל, תאמין שיכולים לתקן Im ata ma'amin sh'ykholim lekalkel, ta'amin sh'yecholim letaken.
Attributed

“I don't believe that happiness is possible, but I think tranquility is.”

"Bill Gates backs immigration reform on Mexico trip" Reuters (21 March 2007) http://www.reuters.com/article/worldNews/idUSN2024750720070321
2000s
“How is it possible to hold such anger against something you don't believe in?”
Source: An Echo in the Darkness

As quoted in Philippine Studies (1953) by Ateneo de Manila, p. 269; also in Everest : The Mountaineering History (2000) by Walt Unsworth, p. 100; but this has also been attributed to Ignatius of Loyola in Think of an Elephant : Combining Science and Spirituality for a Better Life (2007) by Paul Bailey http://books.google.com/books?id=1WWeHgqLoBkC&pg=PT299&dq=%22For+those+who+believe,+no+words+are+necessary%22&hl=en&sa=X&ei=LiGzUor6FdapsASYsYGgBA&ved=0CC4Q6AEwAA#v=onepage&q=%22For%20those%20who%20believe%2C%20no%20words%20are%20necessary%22&f=false
Disputed

“You don't believe magic is possible in lives lived within traditional boundaries.”
Shampoo Planet (1992)

“You are where you are in life because of what you believe is possible for yourself.”