Who said "Leadership by example is the only true leadership."?

This quote is attributed to Indiana Jones.

Leadership by example is the only true leadership. - Indiana Jones

"Leadership by example is the only true leadership."

Indiana Jones Leadership

"It's not the years, honey, it's the mileage."

"Snakes. Why'd it have to be snakes?"

"Fortune and glory, kid. Fortune and glory."

"We are not in a position to know what he knows. We must rely on faith."

"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"