The difference between the Prags and the Fudds.
Pierce Butler lived in the world as it is. We wish to change the world, but to do so we must first live in the world as it is and act accordingly – we must start from where we are, not from where we would like to be.
Hit that link and RTWT. Yes, it rambles and the spelling is atrocious, but do read it. And then read more about Justice Pierce Butler and the other “Four Horsemen“.