The strong overcome their opponents, the mighty crush them, the shrewd outwit them, the cowardly hide from them, but the enlightened transcend them.

Learn from acquaintances, and you are clever;
from friends, and you are intelligent; from enemies, and you are shrewd; but learn from all, and you are wise.

A shrewd enemy will benefit you more than a foolish friend.

If adventurers were cowardly, no one would have crossed the nations; if sailors were fearful, no one would have crossed the oceans; if pilots were gutless, no one would have crossed the skies.

Be who your enemies dread you'll become.

Esteem intelligence, cherish knowledge, and value understanding, but trust wisdom.