Some people know that some things cannot be done but do it, and they are fools; some people know that some things cannot be done, but do it, and they are heroes. Is the intersection between doctors and firefighters only between life and death? The Buddha said: There are eight sufferings in life: birth, old age, illness, death, excess of the five Yins, meeting of resentments and hatreds, not getting what you want, and separation from love. Except that the first four are common to everyone, how many of the last four do you have?