The progress of the belief in Metempsychosis however has been greatly retarded by the many theories and dogmas attached to it by some of the teachers. Not to speak of the degrading ideas of re-birth into the bodies of animals, etc., which have polluted the spring of Truth, there are to be found many other features of teaching and theory which repel people, and cause them to try to kill out of the minds the glimmer of Truth that they find there. The human soul instinctively revolts against the teaching that it is bound to the wheel or re-birth, _willy-nilly_, compulsorily, without choice--compelled to live in body after body until great cycles are past. The soul, perhaps already sick of earth-life, and longing to pass on to higher planes of existence, fights against such teaching. And it does well to so fight, for the truth is nearer to its hearts desire. There is no soul longing that does not carry with it the prophecy of its own fulfillment, and so it is in this case. It is true that the soul of one filled with earthly desires, and craving for material things, will by the very force of those desires be drawn back to earthly re-birth in a body best suited for the gratification of the longings, desires and cravings that it finds within itself. But it is likewise true that the earth-sick soul is not compiled to return unless its own desires bring it back. Desire is the key note of Metempsychosis, although up to a certain stage it may operate unconsciously. The sum of the desires of a soul regulate its re-birth. Those who have become sickened of all that earth has for them at this stage of its evolution, may, and do, rest in states of existence far removed from earth scenes, until the race progresses far enough to afford the resting soul the opportunities and environments that it so earnestly craves.