4531. As it is intelligence and wisdom from the Lord which appear in heaven as light, and the angels are consequently called angels of light, so it is the folly and insanity deriving from the proprium which reign in hell, and those who are there are consequently referred to as those belonging to the darkness. Actually there is no darkness in hell but a dim light like that emitted from a coal fire, in which light they see one another. Without this they would not be able to live. This light of theirs originates in the light of heaven which is converted into that dull light when it enters into their manias, that is, into their falsities and evil desires. The Lord is present with light everywhere, even in the hells, otherwise they would not have any ability to think and consequently to speak; but the light is conditioned by the reception of it. The dim light of hell is that which in the Word is called the shadow of death and is compared to the darkness. With those there it is also converted into darkness when they go near the light of heaven; and when they are in darkness foolishness and stupidity reign. From this one may see that as light corresponds to truth, so darkness corresponds to falsity; and that those governed by falsities are said to be in a state of blindness.