Striking similarity to Sun Tzu's advice: know enemy, and know youself. There's a special emphasis in "The Art of War" that you can't win, even in full strength,

Striking similarity to Sun Tzu's advice: know enemy, and know youself. There's a special emphasis in "The Art of War" that you can't win, even in full strength, if the enemy doesn't expose some weakness. Here Marc rehashes this very idea, that your preparation isn't enough. Instead, to meet enemy's weakness is critical. This ancient idea doesn't require any exceptional intelligence to understand. The hard part is actually discern this weakness, or market.