"Self-discipline manifests itself in countless ways. In a leader I see it as doing those things that should be done, even when they are unpleasant, inconvenient, or dangerous; and refraining from those that shouldn't, even when they are pleasant, easy, or safe. That discipline that causes a young lieutenant to check soldier's feet for blisters or trench foot, will also carry him across a bullet-swept street to support a squad under pressure."