Patience requires that we don’t do injury beyond the villain’s. So, someone did it to you. It was wrong. You’re right. They deserve something. You deserve something else to have happened. But, if you respond at a higher level of cruelty, you become the new villain.
This is a constraint that both requires and cultivates patience. Consider the kung fu master who doesn’t need to land a single strike in order to win a fight. He’s so good that he dodges every attack, wears out his assailant to a point of error, then declares victory with a single, gentle hold.