After being called for urgent surgery doctor came to hospital as soon as possible and changed clothes for surgery. There he saw that the boy's father was pacing in hall waiting for doctor. As father saw doctor coming, he yelled, "Why you took so much time to come? don't you have any responsibility? don't you know my son's life is in danger?"Doctor smiled and said, "I am sorry for being late but I came as fast as I can after receiving the call. please calm down so that I can do my work."Father replied in anger, "How can I calm down? what if it was your son waiting for operation? what if he dies waiting for doctor like you?"Again doctor smiled and asked, "We will do our best. pray for your son's life.""Advising someone is so easy" , father murmured. After few hours when the surgery was complete. Doctor came out happy and said to father, "You son is saved." And without waiting for response from father he went away saying ,"If you have any question ask to nurse."Seeing this father commented to nurse, "Why so arrogant? couldn't he wait for some minute to answer my question concerning my son's surgery?"The nurse answered, "His son died yesterday in a road accident, he was at the burial when we called him for your son's surgery.  and now that he saved your son's life, he left running to finish his son's burial." 
Never judge anyone because you never know how their life is and what they're going through. 