Who said "Knowledge of pain is the only knowledge that matters."?

This quote is attributed to Cletus Kasady.

Knowledge of pain is the only knowledge that matters. - Cletus Kasady

"Knowledge of pain is the only knowledge that matters."

Cletus Kasady Knowledge

"I am the symbiote, the voice in your head, the hunger in your belly."

"You don't understand what I am. I'm not human. I'm so much more."

"Red is my color. It's the only color that matters."

"They made me this way. They created a monster and then acted surprised."

"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."