As to the subject of perfect assimilation, I have just explained how the soul passing through the different planes has borrowed from each of them things that belong to that plane: qualities, tendencies, ideas, thoughts, feelings, impressions, flesh, skin, bone and blood. That which the soul has borrowed he must give back when it has done its work; it was borrowed for a certain time and for a certain purpose. When the purpose is fulfilled, when the time is finished, then every plane asks for that which the soul has borrowed from it, and one cannot help but give it back to that plane. It is this process which is called assimilation. Since man is born greedy and selfish he has taken all things willingly, enthusiastically-he gives them back grudgingly and calls it death.