Three thousand years ago, in ancient China, sages stuck red hot pokers into empty turtle shells to study the way cracks developed on the flat side of the shell. Depending on the pattern made by the cracks, the sages would predict the future and speak with the ancestors.
What is the basis for these and other prophetic visions throughout history? Why did Moses see God in the flames of a burning bush and the Greeks hear the voice of Zeus in the wind of the sacred oak tree of Dodona? When people close their eyes to pray or meditate, whose voices are they hearing?
