Who said "Laughter in the presence of sorrow is an act of defiance."?

This quote is attributed to Vespasian.

Laughter in the presence of sorrow is an act of defiance. - Vespasian

"Laughter in the presence of sorrow is an act of defiance."

Vespasian Humor

Emperor General Ancient Rome 9–79

"I wish I had never been emperor."

"Friends, I have often heard that it is a hard thing to grow old."

"It is the nature of man to desire peace."

"What a king I am leaving behind me!"

"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."