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

This quote is attributed to Suetonius.

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

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

Suetonius Humor

Historian Biographer Ancient Rome 69–122

"Life is not a spectacle or a feast; it is a predicament."

"The greatest power is often simple patience."

"Men willingly believe what they wish."

"Nothing is so unbelievable that the orators of Rome cannot turn it to their advantage."

"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."