Meditation on tone, as expressed in this Sanscrit word OM, will lead us to a knowledge of the secret Doctrine. We find expressed in the merely mortal music the seven divisions of the divine essence, for as the microcosm is the little copy of the macrocosm, even the halting measures of man contain the little copy of the whole, in the seven tones of the octave. From that we are led to the seven colors, and so forward and upward to the Divine radiance which is the Aum. For the Divine Resonance, spoken of above, is not the Divine Light itself. The Resonance is only the outbreathing of the first sound of the entire Aum. This goes on during what the Hindoos call a Day of Brahma, which, according to them, lasts a thousand ages.[4] It manifests itself not only as the power which stirs up and animates the particles of the Universe, but also in the evolution and dissolution of man, of the animal and mineral kingdom, and of solar systems. Among the Aryans it was represented in the planetary system by Mercury, who has always been said to govern the intellectual faculties, and to be the universal stimulator. Some old writers have said that it is shown through Mercury, amongst mankind, by the universal talking of women. And wherever this Divine Resonance is closed or stopped by death or other change, the Aum has been uttered there. These utterances of Aum are only the numerous microcosmic enunciations of the Word, which is uttered or completely ended, to use the Hermetic or mystical style of language, only when the great Brahm stops the outbreathing, closes the vocalization, by the _m_ sound, and thus causes the universal dissolution. This universal dissolution is known in the Sanscrit and in the secret Doctrine, as the _Maha Pralaya_; _Maha_ being “the great,” and _Pralaya_ “dissolution.” And so, after thus arguing, the ancient Rishees of India said: “Nothing is begun or ended; everything is changed, and that which we call death is only a transformation.” In thus speaking they wished to be understood as referring to the manifested universe, the so-called death of a sentient creature being only a transformation of energy, or a change of the mode and place of manifestation of the Divine Resonance. Thus early in the history of the race the doctrine of conservation of energy was known and applied. The Divine Resonance, or the _au_ sound, is the universal energy, which is conserved during each Day of Brahma, and at the coming on of the great Night is absorbed again into the whole. Continually appearing and disappearing it transforms itself again and again, covered from time to time by a veil of matter called its visible manifestation, and never lost, but always changing itself from one form to another. And herein can be seen the use and beauty of the Sanscrit. Nada Brahma is Divine Resonance; that is, after saying _Nada_, if we stopped with Brahm, logically we must infer that the _m_ sound at the end of Brahm