The demand for a perfect Environment as well as for a perfect correspondence is less clear in Mr. Herbert Spencer's definition than it might be. But it is an essential factor. An organism might remain true to its Environment, but what if the Environment played it false? If the organism possessed the power to change, it could adapt itself to successive changes in the Environment. And if this were guaranteed we should also have the conditions for Eternal Life fulfilled. But what if the Environment passed away altogether? What if the earth swept suddenly into the sun? This is a change of Environment against which there could be no precaution and for which there could be as little provision. With a changing Environment even, there must always remain the dread and possibility of a falling out of correspondence. At the best, Life would be uncertain. But with a changeless Environment--such as that possessed by the spiritual organism--the perpetuity of the correspondence, so far as the external relation is concerned, is guaranteed. This quality of permanence in the Environment distinguishes the religious relation from every other. Why should not the musician's life be an Eternal Life? Because, for one thing, the musical world, the Environment with which he corresponds, is not eternal. Even if his correspondence in itself could last eternally, the environing material things with which he corresponds must pass away. His soul might last forever--but not his violin. So the man of the world might last forever--but not the world. His Environment is not eternal; nor are even his correspondences--the world passeth away _and the lust thereof_. We find, then, that man, or the spiritual man, is equipped with two sets of correspondences. One set possesses the quality of everlastingness, the other is temporal. But unless these are separated by some means the temporal will continue to impair and hinder the eternal. The final preparation, therefore, for the inheriting of Eternal Life must consist in the abandonment of the non-eternal elements. These must be unloosed and dissociated from the higher elements. And this is effected by a closing catastrophe--Death.