Who said "In this life, disappointment is the only certainty."?

This quote is attributed to Droopy.

In this life, disappointment is the only certainty. - Droopy

"In this life, disappointment is the only certainty."

Droopy Wisdom

"I'm so happy."

"Hello, I'm so glad to see you."

"That makes me so sad."

"I'm afraid I have some bad news."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."