To be a person of integrity you must be the same person in private that you are in public. Some are publicly "big" but privately "small." In fact, men and women with great talent to lead others and organizations have found themselves unable to lead themselves.
King Saul was publicly big but privately small. He presented much better than he was. In contrast, David was publicly small (a simple shepherd), but privately big. Like King Saul, Pharaoh was publicly big but privately small. On the other hand, Moses was publicly small - a solitary shepherd on the backside of the desert - but privately big. Not coincidentally, Saul and Pharaoh wanted to be leaders. David, on the other hand, wasn't looking for leadership when it came looking for him, and Moses didn't feel at all qualified. (It is a danger sign when being publicly "big" is more important than being privately big.)