After all, human are locked in a prison known as earth.
Whether you're above or below ground makes no difference.
It's just a question of wide and narrow.
People that feel the prison is too narrow and can't take it,
will never be free.
Theirs would be a life just watching the cell bars.
In order to truly be caged,
you have to set up a prison in your own heart.
If you have the energy to whine about dying or whatnot,
why not fight it out in this very cell...
If there's one less noisy monkey around,
you might end up realizing that this cell is pretty spacious.
Taken from Hinowa's line, Gintama.