If you enter, you will be helpless, and you will be unable to fight the soldiers at home; if you leave, you will be invincible to foreign patients, and the country will be permanently destroyed. ——Mencius "Born in sorrow and died in happiness"

1. Without opponents, there is no motivation. I am always grateful to my opponents. Liu Xiang

2. We cannot live without enemies, but we must never live without friends. We must thank our enemies, because they make us strong, and we must thank our friends even more, because it is our friends who enable us to defeat our enemies! Li Lei

3. The enemy may give you advice unexpectedly.

4. The successful person is always the one who does more than his opponent and persists to the end. Chen Anzhi

5. No friendship has a more solid foundation than having a common enemy.