The Dao is an abstract painting with no form, no certainty. Its image is blurred, undefined. To try to explain it is pointless, it must be experienced. You can give this painting a name, but the name cannot do it justice. Two people standing before it see vastly different pictures. Standing before it you sense it has no beginning and since it has no beginning, it has no ending. If you try to begin at the beginning, it is too long, therefore begin at the end.
