We all have a cross to carry.

"Great crustaceans have little crustaceans upon their backs to bite 'em,
And little crustaceans have lesser crustaceans, and so ad infinitum.
And the great crustaceans themselves, in turn, have greater crustaceans  to go on,
While these again have greater still, and greater still, and so on."

An adaptation of the verse penned by the mathematician Augustus De Morgan.