As many people know, the number 7 is the most important number in this particular universe. Well, what is the reason for that? The Undifferentiated Source for this universe at the outset of Creation came into manifestation as a Unity, The Godhead, The Divine Creator of this particular universe. For reasons that will never be known at any Level until merging back into that Source, The Creator chose to first express as a Triplicity, The Triune Godhead, also called The Trinity. Those 3 Aspects of The Creator are known in Hinduism as Shiva, Vishnu, and Brahma. In Christianity, They are called God The Father, God The Son, and God The Holy Spirit. In the occult teachings of Ascended Master Djwhal Khul, They are called The 3 Major Aspects of Divine Will (1st), Love/Wisdom (2nd), and Active Intelligence (3rd).
The Creator then chose to express as a Septenary and create a 7-fold universe by dividing its Manifest Self into what are called The 3 Major Aspects and 4 Minor Attributes of The Godhead. The One became The Three, and The Three became The Seven, The Great Heptomad of all life. In Hinduism, They are known as The 7 Prajapati. Each of The 7 Primary Differentiations of The Godhead emanates a unique Divine Creative Force that permeates the entirety of the universe at all Levels of Existence, and collectively these 7 Forces are referred to as The 7 Rays. By their interplay and interaction, They may be considered to be The Intelligent Creative Forces which brought the universe and all life within the universe into being (refer to "The Seven Rays Explained"). This number 7, which comprises our Creator, is then reflected down through all the Planes of Existence in this universe.
There are 7 Major Levels or Planes of Existence in this universe, which I prefer to call the 7 Densities, and The Universal Logos is The Octave. Each Density has 7 Dimensional Levels within it, and each of those Dimensions has 7 sub-dimensional levels. I can give the planet that we live on as an example in this scheme. This planet is at the moment transitioning from the uppermost Dimensional Level (7th) of 3rd Density into the lowermost Dimensional Level (1st) of 4th Density. This Earth has a total of 7 bodies (at different Dimensional Levels) for this evolutionary scheme, as The Masters taught through Helena P. Blavatsky in "The Secret Doctrine" published in 1888 A.D.
Each of these 7 Earths has 7 Rounds or Incarnations of developement for its life-forms. In each of those 7 Rounds, there are 7 Root Races of Humankind as it progresses up the ladder of evolution. For example, we currently are the 5th sub-race of the 5th Root Race in this 4th Round on this particular Planet Earth. Things are a little more complicated than have been taught; are they not? There are 7 Sacred Planets in this solar system, and Earth is not one of them at this time. The number 7 is found throughout all schemes and levels.
As mentioned, there are The 7 Cosmic Rays which proceed from The Godhead, bringing forth everything in manifestation in the universe, and then this planet was granted in the 1970's 5 Higher Rays which all emanate or branch out of the 7th Ray, making a total of 12 for the crucial time frame on this planet. The Spiritual Hierarchy for Earth is divided into 7 Divisions or Departments, each of which is overseen by one of The 7 Chohans of The 7 Rays. There are 7 Kumaras or Buddhas, Lord Sanat Kumara being The First Kumara and there being 3 Exoteric and 3 Esoteric Kumaras in The Great Council of Shamballa, heading up The Hierarchy (click on "Who Are The Spiritual Hierarchy?").
Incarnate humans are septenary in their beingness with 4 lower bodies and 3 higher bodies. The 4 lower are the dense physical body, the aetheric body, the emotional body, and the mental body. The 3 higher bodies Djwhal Khul calls the Atmic, the Buddhic, and the Manasic. There are 7 musical notes in the occidental scale between the octaves. There are 7 Major Chakras in the Aetheric Body of the human with 21 minor chakras and 49 lesser chakras, all multiples of 7. There are 63 Ascended Masters associated with the Human Kingdom on this planet, 9 x 7. There are 7 endocrine glands which are physical reflections of the 7 Major Chakras. Every 7 years there is a complete turnover and replacement of all the cells in the human body. There will be 7 Years of Tribulation prior to the Dimensional Shift on Earth according to Lord Hilarion, The Chohan of the 5th Ray.
There are 7 colors in the rainbow, and the examples could go on and on. The 7 symbolic Seals of "The Revelations" in the Bible refer to the 7 Major Chakras, and The 7 Spirits before The Throne are The 7 Planetary Logoi of The 7 Sacred Planets, Who are The 7 Major Chakras in the solar system body of The Solar Logos. This is another revelatory offering to an awakening Humanity by The Teachers and Guardians of the Human Race, and I wish you blessings of a 7-fold nature.