The great mistake is in recognising the evolution of the worshippers, while we do not acknowledge the evolution of the Worshipped. He is not credited with the advance that his devotees have made. That is to say, you and I, representing ideas, have grown; these gods also, as representing ideas, have grown. This may seem somewhat curious to you — that God can grow. He cannot. He is unchangeable. In the same sense the real man never grows. But man's ideas of God are constantly changing and expanding. We shall see later on how the real man behind each one of these human manifestations is immovable, unchangeable, pure, and always perfect; and in the same way the idea that we form of God is a mere manifestation, our own creation. Behind that is the real God who never changes, the ever pure, the immutable. But the manifestation is always changing revealing the reality behind more and more. When it reveals more of the fact behind, it is called progression, when it hides more of the fact behind, it is called retrogression. Thus, as we grow, so the gods grow. From the ordinary point of view, just as we reveal ourselves as we evolve, so the gods reveal themselves.