Eisenhower

In order to be a leader a man must have followers. And to have followers, a man must have their confidence. Hence the supreme quality of a leader is unquestionably integrity. Without it, no real success is possible, no matter whether it is on a section gang, on a football field, in an army, or in an office. If a man's associates find him guilty of phoniness, if they find that he lacks forthright integrity, he will fail. His teachings and actions must square with each other. The first great need, therefore, is integrity and high purpose. - Dwight D. Eisenhower