The only real limitation on your abilities is the level of your desires. If you want it badly enough, there are no limits on what you can achieve.
Brian TracyTo be successful, you need to really work hard. And every study in the last 50 years says that successful people say, "I am not smarter than anybody else. I just want to work harder and longer."
Brian TracySelf-discipline is the key to personal greatness. It is the magic quality that opens all doors for you, and makes everything else possible. With self-discipline, the average person can rise as far and as fast as his talents and intelligence can take him. But without self-discipline, a person with every blessing of background, education and opportunity will seldom rise above mediocrity.
Brian Tracy