This article has many meanings. It also makes me think about a lot of problems, which we face every day.
The first page makes me think about people- friends who were at the same level and the one of them became successful, and after that others started to envy him, because of the bad energy he came to the same place as the others. Thus, some people who lead the same life from the beginning doesn't change their life styles, because they are afraid to explore new world.
While I was reading I like this saying: "... by a change from light to darkness or from darkness to light; and he will recognize that the same thing happens to the soul." I'll make an example that first came in my mind: " There was a person who were reach from the birth, who ate,drunk, wore, and used all the good things. One day he lost everything and became a bum- who doesn't have place to live nothing to eat, drink and just the clothes that he had on him. After this situation he couldn't adapt to that environment and hardships. He might suicide himself." This example explain how you would change from light to darkness. "There was a person who was bum from the birth. He didn't have any money to spend on him, and he didn't have place to live, nothing to eat, drink and wear. But one day he became reach, he got problems how to spend his money right way. His eyes are dazzled from all of the money that he hadn't seen before. he couldn't adapt to richness that's why he looses everything." It explains the change from darkness to light.
These two example means " those two kinds of people can't adapt to each others world", but if it will be several times, they could study each others world. At the end they can live in both worlds.