When a soul is born on earth it brings from above the sight, which is the light of the soul, but as the infant grows in the world so his intelligence, covered by impressions coming from the external world, covers the light, until, instead of simple curtains the volumes of impressions so to speak build a wall, covering man's eyes from his own light, the light which man inherits as his divine inheritance. In the Bible it is said, "Raise your light on high, nobody should cover the light under a bushel."