It represents the bridge over the abyss separating divinity from the not quite divine. The four elements of earth, air, water and fire give a four-point analysis of the universe. Earth is associated the practical, restraint, sensation etc. Air is associated with communication, mental-activity, thought etc. Water is associated with emotion, feeling etc.
Fire is associated with energy, assertiveness, intuition etc.
The eternal mysteries from the face of which the uninitiated cannot lift the veil. He knows that this world and its wisdom are insignificant compared to the greater reality. The work of Prof. M. Gauquelin has produced impressive evidence showing that the position's of the planets at a person's birth has an influence on their future aptitudes. The Swiss psychologist C.G. Jung made frequent reference to astrology. At the very least the twelve astrological signs provide a succinct description of the human psyche.