As we go further into humanity's past and study its great spiritual cultures, the need for Vedanta becomes still greater. There is no other way of understanding them except through a living culture which is also as ancient as they. Take Egypt, for example. We have happily found plenty of texts bearing on its religion, but the oral traditions through which its spiritual knowledge was transmitted was lost. Therefore, bare texts do not make a meaning as literalists have found. To understand them, "it is necessary that we tum to the Vedanta ... because the Upanishads provide the purest metaphysics available to us from the primordial past," as Arthur Versluis, the author of The Egyptian Mysteries, says. He himself followed this method and he found that the study of Vedanta "in-fills" Egyptian studies. His labour resulted in an illuminating study of Egypt's ancient religious tradition.