Information is always to be treasured, Raul. It is behind only love and honesty in a person’s attempt to understand the universe. - Dan Simmons

My own guess is that it’s a myth fueled by the same hunger for superstitious verities that drives other religions.

We know for a fact that the Buddha refused to speculate with his disciples on whether there was such a thing such as life after death. 'Such questions,' he said, 'are not relevant to the practice of the Path and cannot be answered while bound by the restraints of human existence.' Most of Buddhism, you see, gentlemen, can be explored, appreciated, and utilized as a tool toward enlightenment without descending into the supernatural.

There are no ghosts, my love. Death is final. The soul is that ineffable combination of memory and personality which we carry through life...when life departs, the soul also dies. Except for what we leave in the memory of those who loved us.