Kate Bush (1958) British recording artist; singer, songwriter, musician and record producer
Song lyrics, The Sensual World (1989)
Also quoted by Voltaire ("Voulez-vous que je vous dise où sont les vrais ennemis du Prince Eugene? Ils sont à Vienne, et les miens à Versailles.")
Source: https://www.bartleby.com/344/391.html
Kate Bush (1958) British recording artist; singer, songwriter, musician and record producer
Song lyrics, The Sensual World (1989)
Robert Smith (musician) (1959) English singer, songwriter and musician
Source: Guitar Player magazine 1992
Sun Tzu (-543–-495 BC) ancient Chinese military general, strategist and philosopher from the Zhou Dynasty
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
Norman Spinrad book The Void Captain's Tale
Source: The Void Captain's Tale (1983), Chapter 15 (p. 201)
“If you don't know where you want to be in five years, how do you ever expect to get there?”
Jay Samit (1961) American businessman
Source: Disrupt You! (2015), p. 47