Aeon of Horus

In the religion of Thelema, it is believed that the history of humanity can be divided into a series of aeons (also written æons), each of which was accompanied by its own forms of "magical and religious expression". The first of these was the Aeon of Isis, which Thelemites believed occurred during prehistory and which saw mankind worshipping a Great Goddess, symbolised by the ancient Egyptian deity Isis. In Thelemite beliefs, this was followed by the Aeon of Osiris, a period that took place in the classical and mediaeval centuries, when humanity worshipped a singular male god, symbolised by the Egyptian god Osiris, and was therefore dominated by patriarchal values. And finally the third aeon, the Aeon of Horus, which was controlled by the child god, symbolised by Horus. In this new aeon, Thelemites believe that humanity will enter a time of self-realization and self-actualization.

Within the Thelemite religion, each of these aeons is believed to be "characterized by their [own specific] magical formula", the use of which "is very important and fundamental to the understanding of Thelemic Magick".

The first Aeon of Isis was maternal, where the female aspect of the Godhead was revered due to a mostly matriarchal society and the idea that "Mother Earth" nourished, clothed and housed man closed in the womb of Matrix. It was characterized by pagan worship of the Mother and Nature. In his Equinox of the Gods Crowley describes this period as "simple, quiet, easy, and pleasant; the material ignores the spiritual" (Equinox of the Gods).

Lon Milo DuQuette remarked that this aeon was "the Age of the Great Goddess", and that it had originated in prehistory, reaching its zenith at "approximately 2400 B.C." Continuing with this idea, he remarked that this period was when "the cult of the Great Goddess" was truly universal. She was worshipped by countless cultures under myriad names and forms. It would also be a mistake for us to conclude that the magical formula of this period manifested exclusively through the worship of any particular anthropomorphic female deity. For, like every aeon, the magical formula of the Aeon of Isis was founded upon mankind's interpretation of the 'perceived facts' of nature, and our Isian-age progenitors perceived nature as a continuous process of spontaneous growth."

The classical and medieval Aeon of Osiris is considered to be dominated by the paternal principle and the formula of the Dying God. This Aeon was characterized by that of self-sacrifice and submission to the Father God while man spoke of his father and mother. Crowley says of this Aeon in his Heart of the Master:

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