“Many think that the short term gain will be worth the long term pain, but it isn’t. In addition, using steroids is cheating,  and there is nothing worse in sports than a cheater. Don’t do it. “ - George Mitchell

This quote means that it’s not right to cheat. If you cheat they'll always be negative consequences. You won’t feel proud of yourself because it wasn’t really you doing that. For example, if you’re going to take a test and you ask your friend for the answers and you get a perfect score because of them you shouldn’t be proud. You have to do you, if you don’t do well you can go back and retake it or study for the next time. Don’t go around cheating. What if you got caught cheating, you’d probably get a worse grade than if you did it yourself. Cheating is bad .