The Upanishads pg 3

I found this reading to be kind of confusing. Some parts made a lot of sense and were beautiful while I found other parts to be weird. Look at the first sentence for example. “That is perfect. This is perfect. Perfect comes from perfect. Take perfect from perfect, the remainder is perfect.” What does this mean?! I try to come up with things that this may be actually saying but ultimately cannot really think of anything. Also (whatever the true meaning of this writing) it does not seem like it could benefit anyone’s life. Maybe for someone in a different culture at a different time could much better benefit from it and gain more wisdom than I can from reading it.
I found some parts of this writing to be very beautiful and true in my own understanding of them. There are many universal principles here that for the most part people except. For example, “Claim nothing; enjoy, do not covet his [God] property,” is a common belief that most religions seem to have. I personally find this to be something that people should live by even though none of us could ever do it perfectly. Many religions teach that we should not be selfish and seek after worldly things for they could never satisfy us fully. The less someone seems to care about earthly possessions the more fulfilled someone seems to be. Whenever I think about whether or not something like money can make us happy I just look at the lives of many celebrities. Sometimes it seems like the richer and more successful someone is, the more likely they are to be depressed and maybe even suicidal. It is probably true that for most people the more they want of something, the less satisfied they are with it. Take money for example. If someone becomes consumed with getting more and more money, the less satisfied they are with the money they have. Someone who makes let say $30,000 a year could be more content and happy than a millionaire who becomes obsessed with money and how much they are making. Now I am not saying that I would rather have $30,000 than a million dollars. Obviously I would take the million in a second! I just think that seeking after worldly things could never fully satisfy any of us (or at least not long term).