The Left Eye of Heru symbolizes the "Power of the God of Light." It implies that one has attained all of the qualities as personified by Horus, that we have vanquished the enemies of Osiris (ignorance, egoism, selfishness, disharmony, mental agitation, etc.) from ourselves.
The right Eye of Horus, also known as the Eye of Ra, the Uraeus, represents the Sun (Ra, spiritual energy, Prana, Chi) and the left eye of Horus, the Moon (Isis-nature, mental power, understanding). At once Horus is the synthesis of spirit (Sun) and body (Moon). It is the power to "see the way" beyond spirit and matter (absolute reality).
The symbol of the two eyes of Horus is most ancient. Having existed in predynastic times (10,000-5,500 B.C.E.), it carried over into the philosophy of Hinduism as The Eyes of Krishna, and in Buddhism as The Eyes of Buddha. The eyes imply a form of vision, a state of consciousness beyond ordinary human perception. In the intervening time when Set had stolen Horus' eyes, he took away Horus' vision of unity. Horus therefore saw the world as Set did, through the state of consciousness of a forceful brute, with unbridled emotion, passion and egoism. Horus lost the light (intuitional vision) of the Sun and was dominated by the Moon (earthly passion - vision of Set) which clouded the mind and impeded higher thought and intuition. Therefore, Setian (body consciousness) vision is hostile to Ra (spiritual vision) and must be fought against until it is controlled (sublimated). As stated in the Egyptian Book of coming Forth By Day in Chapter 23, Setian thinking is the greatest force holding the soul in a state of bondage.
-Egyptian Yoga, Mauta Ashby, page 82
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