“Anger - use it, but don't lose it!”

“What you don't use, you lose.”

“Anger and jealousy can no more bear to lose sight of their objects than love…”

“He could see Bonzo's anger growing hot. Hot anger was bad. Ender's anger was cold, and he could use it. Bonzo's was hot, and so it used him.”

“Just remember, anger is always your enemy. You must keep your emotions in check. The moment you lose control of them, you lose the fight every time. (Takeshi)”

“Anger makes us adroit.”

“But still anger ought be far from us, for nothing is able to be done rightly nor judiciously with anger.”
Sed tamen ira procul absit, cum qua nihil recte fieri nec considerate potest.

“Anger prepares us to fight and fear prepares us to flee.”

“How is it possible to hold such anger against something you don't believe in?”

“There are four things that make a man fight as you just did," the duke explained to Rumbold. "Love, despair, anger, or insanity."

Erik counted them off on his fingers. "Everything to lose, nothing to lose, someone's taken it, or you've lost it.”