What your enemies know can hurt you,
but what your friends know can destroy you.

Love your friends with your eyes closed, but love your enemies with both eyes open.

Imprudent people accumulate adversaries, intelligent people accumulate acquaintances, and enlightened people accumulate friends.

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.

Be who your enemies dread you'll become.

Your father you esteem.
Your mother you pamper.
Your relatives you regard.
Your friends you value.
Your neighbors you respect.
Your enemies you pardon.