In the world of existence there is nothing so important as spirit, nothing so essential as the spirit of man. The spirit of man is the most noble of phenomena. The spirit of man is the meeting between man and God. The spirit of man is the animus of human life and the collective center of all human virtues. The spirit of man is the cause of the illumination of this world. The world may be likened to the body; man is the spirit of the body, because the light of the world is the human spirit. Man is the life of the world, and the life of man is the spirit. The happiness of the world depends upon man, and the happiness of man is dependent upon the spirit. The world may be likened to the lamp chimney, whereas man is the light. Man himself may be likened to the lamp; his spirit is the light within the lamp. Therefore, we will speak of this spirit. The philosophers of the world are divided into two classes: materialists, who deny the spirit and its immortality, and the divine philosophers, the wise men of God, the true illuminati who believe in the spirit and its continuance hereafter. The ancient philosophers taught that man consists simply of the material elements which compose his cellular structure and that when this composition is disintegrated the life of man becomes extinct. They reasoned that man is body only, and from this elemental composition the organs and their functions, the senses, powers and attributes which characterize man have proceeded, and that these disappear completely with the physical body. This is practically the statement of all the materialists. The divine philosophers proclaim that the spirit of man is ever-living and eternal, and because of the objections of the materialists, these wise men of God have advanced rational proofs to support the validity of their statement. Inasmuch as the materialistic philosophers deny the Books of God, scriptural demonstration is not evidence to them, and materialistic proofs are necessary. Answering them, the men of divine knowledge have said that all existing phenomena may be resolved into grades or kingdoms, classified progressively as mineral, vegetable, animal and human, each of which possesses its degree of function and intelligence. When we consider the mineral, we find that it exists and is possessed of the power of affinity or combination. The vegetable possesses the qualities of the mineral plus the augmentative virtue or power of growth. It is, therefore, evident that the vegetable kingdom is superior to the mineral. The animal kingdom in turn possesses the qualities of the mineral and vegetable plus the five senses of perception whereof the kingdoms below it are lacking. Likewise, the power of memory inherent in the animal does not exist in the lower kingdoms.