Once, millionaire and owner of a successful business Richard St. John come to think: "What makes successful people successful?” He interviewed 500 most successful people, including Bill Gates, Oprah Winfrey, Richard Branson and J.K. Rowling. Then, having analyzed hundreds of interviews, biographies and memoirs, he wrote the book "8 to be great". There, he speaks about eight main qualities of leaders. Here are five of them