Who said "Pain is the only honest teacher."?

This quote is attributed to Carnage.

Pain is the only honest teacher. - Carnage

"Pain is the only honest teacher."

Carnage Education

"We are Carnage. We are one. We are beautiful."

"Lethal Protector? More like Lethal Joke."

"I don't need a host. I AM the host now."

"Red is the color of passion, and we are VERY passionate."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."