When people try to pull you down, remember, they had to look up to do so.
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.
Ignorance is your opponent, fear is your enemy, vice is your adversary, virtue is your friend, and wisdom is your helper.
One who thinks for himself is a threat to his enemies, a refuge to his acquaintances, a prize to his friends, and a gift to the world.
Don't downgrade your dreams to upgrade your relationships.
A shrewd enemy will teach you more than a foolish friend.
Love your friends with your eyes closed, but love your enemies with both eyes open.
Be like seeds; do not see dirt thrown at you as your enemy, but as ground to grow.
Your worst enemy can be your best teacher!
The greater the fruit a trees bears, the greater the number of stones thrown at it.