Anger

The first part of anger ... is madness and the second is regret. Passion and blindness are inseparable mates. Beware of anger, for it ends in the humiliation of apology. 
Anger leads to all kinds of evil. When you are angry be silent.
It is not a trait of noble character to be hasty either in anger or in revenge. The anger of a fool reveals itself in what he says, and the anger of a wise man in what he does. Quarrelsomeness is a contemptible habit. Call not yourself a human so long as you are angry.