Gregory's Server“If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.”
Sun Tzu, The Art of War
@kashifshah The Art of War is a banger of a book by the way.
Aside from tactics and strategies that actually come in handy not just in literal, physical war but in any competitive environment, one of its first lessons is that the only truly winning move in war is not to play.