The generation repeat coming and passed. Essence of the generation can be judged by behavior of children at that time. A sign of the times be reflected by popular movie at that time. Good and bad of the present day be judged the generation in the future. A sense of value of the generation in the future change an interpretation of the past. So, human can change bad acts of the past by good acts of the future. If you are crying at events still in progress of your life, you should be laughing at the last of your life.