To Be Or To Do? Marx, Kant and Sinatra

Karl Marx: to do is to be;
Immanuel Kant : to be is to do;
Frank Sinatra: do, be, do, be, do

The illustration is Iluminacion by Hebertsanchez via Wikimedia

{You have to listen to the end, 2.20, to get to ‘dooby dooby do’ 🙂 }