It means: ambitious, even if you are in a cramped situation, you can't be locked up ~~

See:

Scene 2 of Shakespeare's Hamlet:

Ha: Denmark is a prison.

lo: so is the whole world.

Ha: It's very big. It has many cells, jails, dungeons, etc.

And Denmark is one of the worst parts.

lo: we don't think so, your highness.

ha: so ... it's not for you. In fact, the world is not good or bad, it all depends on how you think.

for me, it's a prison.

Luo: that's because of your ambition. Denmark is too small for your mind.

Ha: Oh, my God, I can be enclosed in a walnut shell,

and still think I am a boundless monarch-

as long as I don't have those nightmares.

Guy: Your dreams are your ambitions; Every aspirant's achievements are first reflected in his dreams.

ha: the dream is just an illusion.

Luo: Yes, I think ambition is even more elusive. It's really a phantom.

Ha: If so, then beggars who have no ambition are not "entities",

and emperors and other careerists are not "shadows" of beggars?

do we need to go to court to judge this theory? Because I have racked my brains for this, and I can't think about it any more.