All of your schemes and thoughts and ideas are empty! If you look behind their backs, it is like looking at a mask. If you look behind a mask, you see that it is hollow. There may be a few holes for the nostrils and the mouth—but if you look behind it, it doesn’t look like a face anymore. It is just junk with holes in it. You realize that you are just authoring absurd, nonexistent things. That is the best protection for cutting confusion.
From Training the Mind and Cultivating Loving-Kindness by Chögyam Trungpa, pages 100-101.