Be who your enemies dread you'll become.
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.
In my youth I had three teachers: friends, enemies, and books. In my adulthood I had three professors: God, nature, and life.
Be like seeds; do not see dirt thrown at you as your enemy, but as ground to grow.
Don't downgrade your dreams to upgrade your relationships.
The greater the fruit a trees bears, the greater the number of stones thrown at it.
The most dangerous enemy is the one who can easily make friends with his potential victims!
A shrewd enemy will teach you more than a foolish friend.
Ignorance is your opponent, fear is your enemy, vice is your adversary, virtue is your friend, and wisdom is your helper.
One who conquers fear conquers his greatest enemy.
It is better to help an enemy than to harm a friend.