Peterson says that nothing causes more harm than the evil triad of arrogance, deceit and resentment. If you are feeling resentful, it means two things: Either you are immature so you need to shut up, stop whining and get on with it or tyranny is afoot so the subjugated person has a moral obligation to speak up because the consequences of remaining silent are worse. Of course, it is easier to remain silent and avoid conflict but in the long term, it is deadly. When you have something to say but choose to remain silent, you feed the tyranny. So when should you push back against oppression? If you catch yourself harbouring secret fantasies of revenge. When you feel your life is poisoned and you are developing the imagination to devour and destroy.