Life is like a winding road. Sometimes it is beautiful and sometimes it is rugged and dangerous. The wonder of life is that sometimes you have to drive straight forward and sometimes you have to be tactful. For example, when you encounter setbacks, you have to stand up; when you are rich and prosperous, you have to be tactful. There is a world ahead when you move forward, but when you reach the highest point in life and turn around, there is also a world behind you.