Gnosticism is a historical term for various mystical initiatory religions, sects and knowledge schools that were most active in the first few centuries A.D. around the Mediterranean and extending into central Asia.
These systems typically recommend the pursuit of mysticism or "special knowledge" (gnosis) as the central goal of life. They also commonly depict creation as a mythological struggle between competing forces of light and dark, and posit a marked division between the material realm, typically depicted as under the governance of malevolent forces (such as the demiurge), and the higher spiritual realm from which it is divided, governed by God (the Monad) and the Aeons. To learn more click here
This web sites below are a great source for the heretical gnostic writings