A deeply symbolic and multifacted part of mysticism in every tradition, the seven rays represent the fundamental law of seven, the law of cosmic action and organization. As an expression of a law of nature, the seven rays can be seen in all levels of manifested nature, whether formless or with form.
"The names of the Seven Rays -- which are, Sushumna, Harikesa, Viswakarman, Viswatryarchas, Sannaddha, Sarvavasu and Swaraj -- are all mystical, and each has its distinct application in a distinct state of consciousness, for occult purposes. The Sushumna, which, as said in the Nirukta (11, 6), is only to light up the moon, is the ray nevertheless cherished by the initiated Yogis. The totality of the Seven Rays spread through the Solar system constitute, so to say, the physical Upadhi (basis) of the Ether of Science; in which Upadhi, light, heat, electricity, etc., etc., -- the forces of orthodox science -- correlate to produce their terrestrial effects. As psychic and spiritual effects, they emanate from, and have their origin in, the supra-solar Upadhi, in the ether of the Occultist -- or Akasa." —H.P.Blavatsky, The Secret Doctrine
"The Seven Beings in the Sun are the Seven Holy Ones, Self-born from the inherent power in the matrix of Mother substance. It is they who send the Seven Principal Forces, called rays, which at the beginning of Pralaya will centre into seven new Suns for the next Manvantara. The energy from which they spring into conscious existence in every Sun, is what some people call Vishnu (see foot-note below), which is the Breath of the ABSOLUTENESS..." —H.P.Blavatsky, The Secret Doctrine
"The Tanmatras are literally the type or rudiment of an element devoid of qualities; but esoterically, they are the primeval noumenoi of that which becomes in the progress of evolution a Cosmic element in the sense given to the term in antiquity, not in that of physics. They are the logoi, the seven emanations or rays of the logos." —H.P.Blavatsky, The Secret Doctrine
The Logos, or both the unmanifested and the manifested WORD, is called by the Hindus, Iswara, "the Lord," though the Occultists give it another name. Iswara, say the Vedantins, is the highest consciousness in nature. "This highest consciousness," answer the Occultists, "is only a synthetic unit in the world of the manifested Logos -- or on the plane of illusion; for it is the sum total of Dhyan-Chohanic consciousnesses." "Oh, wise man, remove the conception that not-Spirit is Spirit," says Sankaracharya. Atma is not-Spirit in its final Parabrahmic state, Iswara or Logos is Spirit; or, as Occultism explains, it is a compound unity of manifested living Spirits, the parent-source and nursery of all the mundane and terrestrial monads, plus their divine reflection, which emanate from, and return into, the Logos, each in the culmination of its time. There are seven chief groups of such Dhyan Chohans, which groups will be found and recognised in every religion, for they are the primeval SEVEN Rays. Humanity, occultism teaches us, is divided into seven distinct groups and their sub-divisions, mental, spiritual, and physical... Hence the seven chief planets, the spheres of the indwelling seven spirits, under each of which is born one of the human groups which is guided and influenced thereby. There are only seven planets (specially connected with earth), and twelve houses, but the possible combinations of their aspects are countless. As each planet can stand to each of the others in twelve different aspects, their combinations must, therefore, be almost infinite; as infinite, in fact, as the spiritual, psychic, mental, and physical capacities in the numberless varieties of the genus homo, each of which varieties is born under one of the seven planets and one of the said countless planetary combinations... all adepts and Dhyan Chohans are divisible into seven classes, each of which is guided, controlled, and overshadowed by one of the seven forms or manifestations of the divine Wisdom." —H.P.Blavatsky, The Secret Doctrine
"...there are seven rays of cosmic evolution: 1. The Lunar ray 2. The Mercurian ray 3. The Venusian ray 4. The Solar ray 5. The Martian ray 6. The Jupiterian ray 7. The Saturnian ray What Theosophists state about initiates entering another cosmic ray in each Initiation of Major Mysteries is not true. Each master evolves and unfolds in his own ray, and never changes rays. In the internal worlds, each of the seven rays has its temple of mysteries." —Samael Aun Weor, The Seven Words