Buddhists and Hindus, as well as many other sects, believe that we live our lives in a dream. Instead of characters in a movie, we ourselves are the actors in the drama that is our everyday reality.
Many esoteric faiths, especially Buddhism, attempt to wake us from this dream and remind us who we really are. They aim to show us the real context of all that is "out there" in the external world so that we can, once again, regain our true identity as the observer. The awakening from this dream is called "enlightenment."
Symbolically a dorje represents the 'thunderbolt of enlightenment,' that abrupt change in human consciousness which is recognised by all the great religions as a pivotal episode in the lives of mystics and saints. Once "enlightened," the observer can detach from the personal importance of money, romance, food and even life itself. Happiness then comes from inside -- not outside -- of the observer who recognizes that he (or she) is part of the Creation. (Mondovista.com)