1002. 'Not eating' means not mixing together. This follows from what has been said above. Regarded in itself eating animal flesh is something profane, for in most ancient times people never ate the flesh of any beast or bird, but only different kinds of grain, especially wheaten bread, also the fruit of trees, vegetables, milk, and milk products such as butter. Slaughtering living creatures and eating their flesh was to them abominable, akin to the behaviour of wild animals. Service and use alone was demanded of those creatures, as is clear from Genesis 1:29-30. But in the process of time when mankind began to be as savage as wild animals, indeed more savage, they first began to slaughter living creatures and eat their flesh. And because man had become such, he was permitted to do so and is still permitted today. And insofar as he does so from conscience, it is quite legitimate, for his conscience is given form from all those things he presumes to be true and so legitimate. Consequently nobody nowadays stands in any sense condemned because he eats meat.

Darkness" is a state without light. "Light" is truth from the Lord, so "darkness" represents a state where truth is lacking. Here's a cogent passage from Arcana Coelestia: "The person who has yet to be regenerated is called 'a void and an empty earth', and also 'ground', in which no good or truth at all has been sown - 'void' where there is no good, and 'empty' where there is no truth. Consequently there is 'thick darkness', or stupidity and lack of knowledge about anything that has to do with faith in the Lord and so anything that has to do with spiritual and celestial life. (Arcana Coelestia 17)