Again, there is nothing to hinder a rhetorician or
a geometer or a blacksmith from working at his
trade whether he is a knave or a fool, but nobody
can be a parasite who is either a knave or a fool.
 TYCHIADES 
Goodness! What a fine thing you make out
Parasitic to be! I myself already want to be a
parasite, I think, rather than what I am.