Because we are constantly busy, it always feels like we don’t have enough time, yet time never runs out; and while our life feels very long, it ends quickly. That is why it is in our nature to work throughout our lives. Even though humanity creates artificial intelligence and robots to give ourselves more free time, people will not be left without work. Humanity will always find something to do. And when we work, we make mistakes. It is natural for us to make mistakes. If we never make mistakes, I wonder, does that mean we’ve stopped being human? So let's keep going with what we do. Besides, have you ever noticed? Great happiness never returns; only small joys come back. Most of the time, we earn this happiness through dedication and hard work.