Because that idea is within you. It was your own heart beating and you did not know; you were mistaking it for something external. It is the God within your own self that is propelling you to seek for Him, to realise Him. After long searches here and there, in temples and in churches, in earths and in heavens, at last you come back, completing the circle from where you started, to your own soul and find that He for whom you have been seeking all over the world, for whom you have been weeping and praying in churches and temples, on whom you were looking as the mystery of all mysteries shrouded in the clouds, is nearest of the near, is your own Self, the reality of your life, body, and soul. That is your own nature. Assert it, manifest it.