Man does not really notice how far this spirit follows a person on the path of spiritual progress. A person may arrive at the very gate of the heavens, and even to that length this spirit will travel with him. It may become weaker, but it is there; only, this spirit has no entrance into the shrine of God, and the soul which carries this spirit with it has no entrance into that perfect abode. He may advance as far as the gate of the inner temple, but he is not allowed in; he is held back by the power of that same spirit of agitation. For the shrine of God is called Dar-e-Sala'm, which is the same as Jerusalem. It means the door of peace, and agitation is not allowed to enter through the door of peace; it must stay outside. When the ancients said, "You cannot follow two masters, God and Satan," this meant that Satan is the spirit of agitation which is to be found within ourselves, while God is the spirit of peace in whom is our happiness; and we cannot follow both of these masters.