Mercury occupies a most important position in our lives and in esoteric astrology. It is Mercury, representing the Mind which acts as the ~illuminating principle~ of human life. It is Mind which allows humanity to be a conscious conduit for the down pouring of energies from higher realms. Mercury truly is the messenger of the gods. The scribe that channels of the infinite and conscious experience.
Mercury rules Gemini and Virgo, and exalts in Virgo
Everybody has a sign in Mercury and a sign on the third/sixth house cusp