C.G.Jung

The pairs of opposites are torn asunder, the resulting division or strife leads to disaster, for the unconscious soon begins to intrude itself violently upon the conscious processes. Then odd and peculiar thoughts and moods supervene, and not infrequently incipient forms of hallucination, which clearly bear the stamp of the internal conflict.

The devs are the shining gods of the day, of the clear blue sky, of things visible in the daylight, while Asura is a god within, a god of chiefly spiritual and moral character.

When you understand a thing, you say: “I see”—and in order to see you need light.