The last line is a version of the proverb: chi è avvezzo a dir bugie, non crede a nessuno. XXXVII.

Uber's Niederträchtige Niemand sich beklage: Denn es ist das Machtige Was man dir auch sage: it is no use to complain of low aims; for, whatever people may say, they rule the world.

"Ay, dir-r-tyhe's always that.