The root of fear is believing in oneself too much, which makes oneself very vulnerable. It’s as if you have a big cut or burn on your body, something that needs protection. Then beyond that, you are still haunted by your wound, so you protect even your Band-Aid. How do you overcome fear? How do you stop believing in yourself too much? Cheerfulness, or a sense of humor, is the starting point. And then not holding onto oneself too much is the second point.
From “The Shambhala World” in The Collected Works of Chögyam Trungpa, Volume Eight, pages 392–393