Gnosis

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“The ancients said: "Nosce te Ipsum." 
"Man, know yourself... and you shall know the universe and the Gods." How could one know the Astral world if one does not know oneself? How in truth could one know the Universal Mind if one does not his own mind? How could one know the world of the Natural Causes, when one does not know the causes of his own psychological errors?” 

Master Samael Aun Weor from a lecture - Seriousness in the Esoteric Work