I find this quote to be quite inspirational. That such a tremendous leader would attribute leadership success across disciplines, fields, etc. to a moral virtue speaks volumes in my mind.
“The supreme quality for leadership is unquestionably integrity. Without it, no real success is possible, no matter whether it is on a section gang, a football field, in an army, or in an office.”
Dwight D. Eisenhower (1890-1969) ― President of the United States, 1953-1961