All mental suffering of a person is essentially caused by oneself rather than the external world.

This may sound counterintuitive at first glance, but those who understand will agree with this point.
For example: when faced with insults and judgments from others, people generally naturally think they are hurt emotionally.
But whether it actually causes you harm depends on how you perceive the situation.
If you care about these, you will inevitably feel hurt.
But if you try to ignore or understand the other person, then there is no harm.
And this is not about being like Ah Q.
——
GN