But light is everywhere. Whether electricity, or gas, or candle, it is all the same; though light in its perfection, as in the sun, can be observed better than the smaller forms of light. Science has come to understand that the light of the sun is in all things, but all religions have understood this from the beginning. The Hindus and Egyptians taught it. All over the East the worship of the sun was the first to come into existence. Only later were the sun-worshippers considered infidels, or heathens, or pagans. But as sun-worship is the natural religion, it is true that every religion can be traced to it. The external light was the first thing that impressed the heart of man with the idea of God. No doubt the inner light helped, but that too is light. Therefore both the external and the inner light reveal the mystery of the source and secret of all religions.