Who said "Knowledge of the self is the hardest knowledge to gain."?

This quote is attributed to Druig.

Knowledge of the self is the hardest knowledge to gain. - Druig

"Knowledge of the self is the hardest knowledge to gain."

Druig Knowledge

"Why do you care what they think? You're eternal."

"Minds are so easy to control when you understand them."

"I've watched civilizations rise and fall. None of it matters."

"Love is a weakness for those who can't afford it."

"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."