"人们知道自己在做什么。通常，他们知道自己为什么这样做。但他们不知道的是他们所做的事情有什么影响。"

Simplified Meaning:

People are usually aware of their actions and the reasons behind them, but they often don't realize the impact of their actions on others and the world around them. For example, a person might decide to work long hours because they want to provide for their family. They understand they work hard to earn money and that it's important for their family's well-being. However, they might not see that their constant absence affects their family's happiness and their own health. Over time, the lack of time spent with family could lead to emotional distance or misunderstandings, and the stress of overworking could harm their health. It's important for people to think about their actions' broader consequences, not just the immediate reasons and results. By doing this, they can make better choices that improve not only their own lives but also the lives of those around them.