'''Manicheanism''' (Manichaeism), was a belief system that teaches that there exists two separate, opposite and equally ultimate Principles: the Light and the Darkness. This concept is known as [[dualism]], and it is the [[heart]] and soul of Manicheanism.
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[[Image:Yin_yang.jpg|thumb|right|600px|The diagram of the yin and yang as illustrating the Manichean doctrine of separate, opposite and equally ultimate Principles of Light and Darkness.]]'''Manicheanism''' (Manichaeism), was a belief system that teaches that there exists two separate, opposite and equally ultimate Principles: the Light and the Darkness. This concept is known as [[dualism]], and it is the [[heart]] and soul of Manicheanism.