The relation of the constant whole of nature to its variable parts, the relation of the general to the specialties composing it, includes, if we fully grasp it, a perfect conception of the human mind as well as of the understanding and enlightenment which it acquires. This mind cannot enlighten itself as to its special nature without observing how it came to enlighten itself as to the nature of other specialties. We then find that it has likewise enlightened itself on religious phenomena by recognizing them as a part, as a variation, of the general phenomenon of the constant, eternal, natural universe. Hence secular nature, which is at the same time eternal and temporal, is the mother of religious nature. Of course, the child partakes of the nature of the mother. Religion, historically considered, arises from nature, but the determination of the date of the beginning of this specialty is left as much to the choice of man as that of the point where the cold and the warm meet. The general movement of nature, from which arise its specialties, proceeds in infinite time. Its transformations are so gradual that every determined point constitutes an arbitrary act which is at the same time arbitrary and necessary; necessary for the human being who wishes to gain a conception of it. A perfect conception of religion, therefore, goes right to the center of the question, to the point where the religious specialty reaches a characteristic stage, to its freezing point, so to say. From this standpoint, heat and cold may be sharply defined; likewise religion. If we say, for instance, that religion is the conception of a supernatural spirit who rules nature, and the reader thinks this definition somewhat appropriate, the simple demonstration of the achievements of philosophy in the field of understanding or dialectics proves that this religious conception is untenable in this world of the human mind which knows how to obtain a logical picture of its experiences. To desire to preserve religion for the people as a sharply defined and finite thing is contrary to all logic and equivalent to swimming against the tide. On the other hand, it is equally illogical to identify religion after the manner of Lazarus with the conception of natural infinity or infinite nature, because that promotes mental haziness. The laws of thought obtained by philosophical research give us considerable enlightenment about the infinite material process, the nature of which is sublime enough to be worthy of religious devotion, and yet special and matter-of-fact enough to wash the dim eyes with natural clearness.