There is nothing besides a spiritual world; what we call the world of the senses is the Evil in the spiritual world, and what we call Evil is only the necessity of a moment in our eternal evolution.
One can disintegrate the world by means of very strong light. For weak eyes the world becomes solid, for still weaker eyes it seems to develop fists, for eyes weaker still it becomes shamefaced and smashes anyone who dares to gaze upon it.

54 - Aphorisms (1918)