Complete works, know thyself, vol. 18

'"Know thyself!" All science and all wisdom lies in knowing ourselves, in finding ourselves, in the fusion of our lower self with our higher self. The symbol of the initiate who has succeeded in this is the serpent with its tail in its mouth. A serpent forms a straight or wavy line, and a line is limited. But the serpent with its tail in its mouth forms a circle, and a circle represents the infinite, the limitless, the eternal.
Those who succeed in becoming a circle enter a world without limitations where the "above" and the "below" are no longer separated, because all the powers and all the riches and virtues of the true, higher self have been infused into the lower self. The higher and the lower become one and a human being becomes a divinity.' Omraam Mikhaël Aïvanhov