Source: True Grit (1968), Chapter 6, p. 151 : exchange between 'LaBoeuf' and 'Rooster Cogburn'
“You think when you don't want to do anything. Thinking is a poor alternative to acting. Your thinking is consuming all your energy. Act, don't think!”
As quoted in A Taste of Death: Thirty Days with U.G. in Gstaad, Switzerland http://www.scribd.com/doc/3101240/A-Taste-of-Death (1995) by Mahesh Bhatt. Bhatt precedes this quote with the observation "You are what you do, not what you say you want to do" which has sometimes been misquoted as part of Krishnamurti's statement.
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U.G. Krishnamurti 40
Indian philosopher 1918–2007Related quotes

[2014-11-09, Television series, Face the Nation, CBS], quoted in [2014-11-09, George W. Bush: ‘You have to earn your way into politics,’ nothing ‘is ever given to you’, David Edwards, Raw Story, http://www.rawstory.com/rs/2014/11/george-w-bush-you-have-to-earn-your-way-into-politics-nothing-is-ever-given-to-you/, 2014-11-22]
2010s, 2014

“I don't think you can do anything for anyone without giving up something of your own.”
The Natural (Farrar, Straus and Giroux, 2003) p. 149 http://books.google.com/books?id=wCWhegoGUxwC&q=%22I+don't+think+you+can+do+anything+for+anyone+without+giving+up+something+of+your+own%22&pg=PA149#v=onepage. (originally published 1952)

“And don't you let your guard down for a second because you think anything's inevitable.”
Source: Gregor and the Code of Claw

“You think You're frightening me with Your hell, don't You? You think Your hell is worse than mine.”
Source: The Portable Dorothy Parker

Song lyrics, All This Useless Beauty (1996)
Source: The Other End (of the Telescope)