Who said "The pursuit of power without principle leads to ruin."?

This quote is attributed to Tom Hagen.

The pursuit of power without principle leads to ruin. - Tom Hagen

"The pursuit of power without principle leads to ruin."

Tom Hagen Leadership

"I'm a consigliere, not a driver."

"Never discuss business with a mouth full of food."

"A lawyer with his briefcase can steal more than a hundred men with guns."

"The Don has plans for you."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"