Who said "The more you learn, the sadder you become."?

This quote is attributed to Droopy.

The more you learn, the sadder you become. - Droopy

"The more you learn, the sadder you become."

Droopy Knowledge

"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."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."