We take our point of view so much for granted, as if the world were really as we see it. But it doesn’t take much analysis to recognize that our way of seeing the world is simply an old unexamined habit, so strong, so convincing, and so unconscious we don’t even see it as a habit. How many times have we been absolutely sure about someone’s motivations and later discovered that we were completely wrong? How many times have we gotten upset about something that turned out to have been nothing? Our perceptions and opinions are often quite off the mark. The world may not be as we think it is. In fact, it is virtually certain that it is not.
From Training in Compassion: Zen Teachings on the Practice of Lojong by Norman Fischer, page 63