道之为物,惟恍惟惚;惚兮恍兮,其中有象;恍兮惚兮,其中有物;窈兮冥兮,其中有精;其精甚真,其中有信。· What is known as Tao is vague and indefinite. Vague and indefinite,it represents images; indefinite and vague,it embodies substance. Distant and dark,it embraces semenlike essence. The essence is a genuine existence that can be tested as true.