The reason for all manifestation is that manifestation is God's nature. By this He obtains His satisfaction through the fulfillment of the purpose of the whole creation. But God's satisfaction is not something He is only conscious of; it is something which belongs to Him but is brought to fulfillment. Joy is something which belongs to us, but it is aroused by a certain emotion, a certain action; so this whole creation, which is an action, brings to God the satisfaction for which it was created. It does not bring anything new to God; it only makes Him conscious of what He is.