“Knowing the enemy enables you to take the offensive, knowing yourself enables you to stand on the defensive.”

“Security against defeat implies defensive tactics; ability to defeat the enemy means taking the offensive.”

“If you know the enemy and know yourself, your victory will not stand in doubt; if you know Heaven and know Earth, you may make your victory complete.”

“When you look at the sky, you must know that you look at the cosmic factory which enabled you to exist as a live being!”

“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.”

“Hence the saying: 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.”