“Do you even know who the enemy is?"
"I think… it's me".”
Source: It's Kind of a Funny Story
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Ned Vizzini 81
American writer 1981–2013Related quotes

Variant translations
If you know others and know yourself, you will not be imperiled in a hundred battles; if you do not know others but know yourself, you win one and lose one; if you do not know others and do not know yourself, you will be imperiled in every single battle.
Know your enemy and know yourself, find naught in fear for 100 battles. Know yourself but not your enemy, find level of loss and victory. Know not thy enemy nor yourself, wallow in defeat every time.
Literal translation: Know [the] other, know [the] self, hundred battles without danger; not knowing [the] other but know [the] self, one win one loss; not knowing [the] other, not knowing [the] self, every battle must [be] lost.
Source: The Art of War, Chapter III · Strategic Attack

"A los que vienen hablando de que me voy a bajar de la candidatura, yo les digo: Ni lo piensen, no saben de la fibra de la que está hecho uno"
Said one day before getting off the presidential elections on May 13th, 2003

To Emma, recorded by secret spy listening device WS-M/13 located in Kaltenbrunner's bedroom, 1/14/1935. Quoted in "Kröger's Revelation" - by Viktor Pelevin - 1991 - Page 277

“If you ask me to play myself, I will not know what to do. I do not know who or what I am.”
As quoted in Halliwell's Filmgoer's Companion (1988) by Leslie Halliwell, p. 622

Omitted portion of an interview between Stalin and Emil Ludwig (13 December 1931) http://chss.montclair.edu/english/furr/research/stalinludwig_missing_eng.html
Stalin's speeches, writings and authorised interviews

Julie Barenson, Chapter 15, p. 163
2000s, The Guardian (2003)

The Discover Interview: Lisa Randall (July 2006)