To answer your question, I had to check for something relating to Manichaeism and St. Augustine, since it was in connection with a little reading by and about the latter that, I suppose, I learned most of what I know (or knew) about it. I found this:
"Mani combined impressive teaching, reinforced by hymns and splendidly produced books, with effective organisation. He taught that Good and Evil are equal powers, and both have always existed. Each has a kingdom, Good the kingdom of Light and Evil the kingdom of Darkness. Darkness invaded Light, and fragments of light are still entrapped in the darkness; this world was created in order to free them. Jesus of Light, who is pure spirit, shows humans how the light may be freed, and the Suffering Jesus is the Light which is entrapped in this world. The human soul is a fragment of Light which has fallen from its home, the kingdom of heaven, and is trapped in the body. It can escape by disciplining the body and with the help of saving powers."
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www-personal.umich.edu]