: "Sun Tzu seeks to attack" said: "Know yourself and know yourself, and you will be invincible; Know yourself and yourself, one wins and one loses; If you don't know each other, if you don't know your friends, every battle will be very dangerous. "

"The Art of War Attack" said: "Know yourself and know yourself, and you will win every battle; Know yourself and yourself, one wins and one loses; If you don't know the enemy's situation, you will be invincible. " It means that in military disputes, know yourself and know yourself, and you will win every battle. If you don't know yourself and know yourself, the chances of winning or losing are half; If you don't know yourself and yourself, you won't be defeated.