What does the song "Time Goes by" mean?

The lyrics of "Passing Years" express this meaning: all the beautiful scenery of the world of mortals are passing by, and dreams are all over. Time flies and life flies. We are all passers-by of the years! Come empty-handed, go empty-handed, and at the end of time, at the end of life, turn into clouds. Therefore, if we live, we must live wonderfully and freely.