Who said "The secret source of humor is not joy but sorrow."?

This quote is attributed to Philip Roth.

The secret source of humor is not joy but sorrow. - Philip Roth

"The secret source of humor is not joy but sorrow."

Philip Roth Humor

Novelist American 1933–2018

"The road to hell is paved with works-in-progress."

"I think being funny is not anyone's first choice."

"We're all looking for a way out of the human condition."

"No one in this world gets an easy birth, excepting S.O.B.s."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."