The theme best supported by the passage is the following:
- Death conquers everyone in the end.
The reason is that Imperious Caesar is dead and that death is impossible to stop.
I was able to find the passage from Hamlet online:
Imperious Cæsar, dead and turn'd to clay,
Might stop a hole to keep the wind away:
O! that that earth, which kept the world in awe,
Should patch a wall to expel the winter's flaw.
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