“Sez Who?”

I’m reading through Keller’s Reason for God and came upon this quote from the “late Yale law professor Arthur Leff” that perked my interest as Keller discusses the conundrum of human dignity:
When would it be impermissible to make the formal intellectual equivalent of what is known in barrooms and schoolyards as “the grand Sez Who?” [...]

The Problem with the World

In Philip Yancey’s introduction to G.K. Chesterton’s classic work, Orthodoxy, he writes:
When the London Times asked a number of writers for essays on the topic “What’s Wrong with the World?” Chesterton sent in the reply shortest and most to the point:
Dear Sirs:
I am.
Sincerely Yours,
G.K. Chesterton