It means not to trust others too much. It is better to trust yourself than to trust anyone. If you cannot distinguish the people you should not trust, trust the wrong person, or the person you trust betrays you, say Saying things you shouldn't say or doing things you shouldn't do may bring consequences as if you're going to hell.

"Hell is other people" is a line from the existential philosopher Jean-Paul Sartre (1905-1980) in his play "The Interval" (also known as "Confinement"). Sartre explained: "This sentence is often misunderstood. Some people think that I meant that our relationships with others are always poisonous, always hellish. I mean, if a person is with If the relationship with others deteriorates, then others are in hell. There are indeed a lot of people in the world who live in hell because they rely too much on the judgment of others. But this does not mean that it is impossible to have another relationship with others. kind of relationship.