"Newton said that this subtle ether penetrates through all, even the hardest bodies, and is concealed in their substance. Through the strength and activity of this spirit, bodies attract each other, and adhere together when brought into contact. In it, and by it, distance is annihilated, and all objects touch each other. Through this "life spirit" light also flows, and is refracted and reflected, and warms bodies. Through it we are connected in sympathy with all other souls, and all the objects of nature, even to all the heavenly bodies. The word ether is from "αιθω." to light up or kindle. According to Pythagoras and all the oldest philosophers, it was viewed as a divine luminous principle or substance, which permeates all things, and, at the same time, contains all things. They called it the astral light. The Germans call it the "Weltgeist," the breath of the Father, the Holy Ghost, the life-principle." [Bloomfield-Moore, The Fountain Head of Force]
There exists a force in Nature, in which the individual who will master it and knows how to direct it, might throw the world into confusion and transform its face.
This force consists of a Universal agent having equilibrium for its supreme law. by the direction of this agent we can change the very order of the seasons, produce in the night the phenomena of day, correspond & discern instantaneously from one end of the earth to the other, heal or hurt at a distance, and endow human speech with a Universal reverberation and success.
When it produces refulgence (radiant shining) it is called Light.
The inherent force when it is put into activity is called Magnetism.
In infinite space, it is Ether, or Etherized Light; it becomes Astral Light in the stars which it magnetizes
in man it forms the Astral Body, which is a magnet that draws or repels the Astral Light under the pressure of the will. The will of intelligent beings acts directly upon this Etheric Light.
This electricity of the soul, this spiritual and universal Ether, which is ‘the ambient medium’ of the metaphysical or incorporeal world, is the great phenomenon of life before time, and life beyond.
It is diffused through infinity; it is the substance of heaven and Earth, for it is either fixed or volatile according to its degree of Polarization.
It is substance and motion at one and the same time; it is a fluid and a perpetual vibration, while in organized beings it becomes Magnetic Light/Magnetic Fluid.
This ambient and all-penetrating fluid, this ray detached from the Sun’s splendor, and fixed by the weight of the atmosphere and by the power of central attraction; this body of the Holy Ghost, which we call the Astral Light and the Universal Agent; this electro-magnetic Ether, this vital and luminous caloric is represented on monuments throughout antiquity.
It was termed by Hermes Trismegistus the Grand Telesma, and is precisely what the medieval adepts called the First Matter of the ‘magnum opus’.