This story is allegorical. The idea is that Moses was looking for light to make it his life's sustenance. But he had to climb on to the higher planes. It was not possible to get it on earth where he stood; it was necessary that he should climb to the top. And then there was not only a light, but it was lightning. It was a light which was beyond the power of Moses to withstand, and he fell down. What is this falling down? To become nothing, to become empty. When he reached that state of emptiness, then his heart became sonorous, and he found communication with God through everything in the world. In the rock, tree or plant, in the star, sun or moon, in whatever he saw he found communication with his soul. So everything revealed its nature and secret to Moses.