We have a Marlboro Man Theory of leadership and change, especially in America, but in fact anything great that's accomplished is accomplished by many hands.
Sometimes, with leaders, the stakes are very high indeed. Churchill, in WWII, for example, could not afford to utter publicly his concerns about England's ability to survive Hitler's onslaught. He thought about them, but the leadership conversation sometimes needs to inspire, not voice doubt.
There are four different kinds of power in a communication: position power (the CEO talking to her direct reports), emotion power (passion sometimes rules the day), expertise (people often listen to the most knowledgeable person in the room), and conversational power (the subtlest, this is the ability to direct the conversation through body language).
The Dalai Lama is my personal (and the world's) hero and has been for me since I was 17 and I first learned about him. His openness and acceptance of the world and his focus on others are constant inspirations for me.
The unconscious mind governs our decision-making, and much of our communications. It's imperative, if you want to be a successful leader, to become aware of these key human actions.