One of the key principles of money is ‘opportunity cost.’ It means that when I buy something, I have to give up something else in return. We think we buy because we need something, but we often forget that we could buy something else instead. We rarely consider ‘opportunity cost’ when making a purchase. We do not compare other values against our needs. Buying something means giving up something else, but we often don’t realize it. When we spend money, we should also consider the ‘opportunity cost’; yet, in reality, we aren’t trained to do so. By making a purchase, we bypass the value comparison that may not offer any additional benefits. Maybe it’s because we lack knowledge, or perhaps the idea isn’t appealing. - Joseph’s “just my thoughts”
The hospital is where patients are healed. Therefore the hospital is full of patients. The hospital must be able to keep patients healthy and accommodate many patients at any given time. The church is a place to call sinners. There are undoubtedly many sinners in the church. But what if there are only sinners who do not repent? Filters are tools that get rid of dirty things and clean them. If we don't clean it, it's the dirtiest. "Self-purification" restores the original substance. If the instructor omits "self-purification," the absurd result will occur as in the previous example. Don't be sad or angry even if life deceives you. - Joseph’s “just my thoughts”