I thinks the person should NEVER give up in order to be succeed,they should try to practice the thing that they will do it such as sport or job.
All of them,its need to lost a lot of the time and lost for relationships with other. By the time ,a person in order to be succeed,spend a long time for practice to hard and get the professional skill. As the young athlete need to use many time to practice the skill ,They may give up activities about study and hobby.They can not spend time too much with family and friend. that is Sacrifices to succeed. All of the athlete should to do.