There is a profound difference between being busy and being effective. While others are busy talking, boasting, or explaining their value, the disciplined leader is simply building. I think this is the discipline of silence. It is the understanding that you do not need to prove yourself with words. You do not need to explain the "how" or the "why" to those who are merely observing. When you operate with quiet intensity, you guard your focus and protect the destiny of your project.