"All anger is not sinful, because some degree of it, and on some occasions, is inevitable. But it becomes sinful and contradicts the rule of Scripture when it is conceived upon slight and inadequate provocation, and when it continues long."

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When you say something really unkind, when you do something in retaliation your anger increases. You make the other person suffer, and he will try hard to say or to do something back to get relief from his suffering. That is how conflict escalates.

— Nhat Hanh