Within the light, a stain grew, a place where no light blossomed ..... darkness. Some had seen the possibility of a different evolution. An end to equality.
As related, linked, matters tend to affect each other, the inequality of substance had taught the light to perceive power. Some saw the chance to rule the light, to create a, never before immagined, universal heirarchy.
The struggle began.
Darkness spawned knowledge in the substance who were not masters. This substance craved power, they used this knowledge to seek out those who upheld the lore. They seized the lore for themselves, subverted it, hid it, controlled it. For the light-become-substance there was no way back. No freedom to choose, nothing left but extinction.
The light fought back.
Careful to observe the dictates of their vision; the freedom to choose, they seeded the faithful with the means to return.
Over time, backwards and forwards, the knowledge passed from the darkness to the light, passed from the light to the darkness. Never any equilibrium, never any balance. The universal battle, the one true struggle ......