It is as wrong to try to study Nature from the operations of her physical laws as to govern and guide human beings by the aid of the deceptive light of those laws. The physical is the manifestation of the mental plane, as the mental is the manifestation of the spiritual plane, as I have shown in previous Sections. The phenomena of the physical plane of Nature are deceptive to the purely physical vision because they are the product of Tama—darkened Rāja. Deceptive also are the phenomena of the mental plane—though not as deceptive as those of the physical—to a mental vision the light of which is not derived from the spiritual plane—the mysterious machine room which alone supplies the life-substance and springy of action to the mental and physical planes. The student of physical and mental Nature who is not provided with the microscope of spiritual insight is apt almost invariably to read her in both these aspects incorrectly. He should not, therefore, be considered a safe guide for the healthy and harmonious development of human character, which is but a part and phase of one whole Nature called the Universe. The laws operating in the deepest depth of Nature can only be seen and studied by the illumination of the soul, the Radiance of Krishna's Body. These the Brāhmans, the portion of the Golden Age people who still retain their high state of spirituality, study and learn and utilize in codifying principles and rules for regulating the daily life of the rest of the people. The conception of the caste system betrays their intimate knowledge of these inner natural laws upon which it is based and the profound wisdom with which its organization to the minutest details is arranged. The organization of the caste system is, in fact, devised after the organization of the human body—after the inner and the outer human body. The entire caste system is like a huge living human body—living with its organs and senses in harmonious working order and its mind contributing to and enjoying the effect of that harmony and feeling the higher planes to which the effect of that harmony elevates.