In his well-known essay "on Contradiction", Mao Tse-tung uses the words of another Chinese leader to stress a point which he considers to be vitally important in waging successful military campaigns. Quoting from Sun Tzu, Mao says: "Know you enemy and know yourself and you can fight a hundred battles without disaster."
Jackson, Arthur D.
Naval War College Review: Vol. 20
, Article 6.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol20/iss9/6