Grant Cardone, author of "Be Obsessed or be Average," and the owner of a $500-million real estate empire, used to play golf more than three times a week and had become entitled with his successes during games, which led him to a poor family life and decline in his social status. For his own success, he gave up his biggest hobby, and led himself to being the successful man that he is today. Although his story wasn't about sacrifice for others, he still gave up an important part of his life so he could