These weeks I have learned some courses about the guilt.The author said for many years people have been encouraged to give up their guilt to live more comfortable,but the guilt is also the best civilizer.It can help prevent us  from doing wrong  and injustice things.That makes me think of a thing that makes me feel guilty.That was the first formal day in junior high school just after military training,so I didnot know others very well .This morning I got up very early to take part in the morning exercises,and if I could  not reach school before the right time I would be punished .So I hurried to school by bike. When I passed a corner ,I heared someone was moaning,but it wasn't clearly.I just thought the punishment if I can't take the exercise on time,so I pretended to heard nothing and went on  riding  my bike.When the exercise was ended ,I heard my teacher said that one of my classmates was injured.After this ,I always felt very guilty to her,and later we became good friends and we kept in touch with each other till now.