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

 This means that if you cheat it won't hurt at that moment but it will hurt for the rest of your life because you will have to live with that on your continues. He also means that when you cheat you not only affect yourself but others to. For example if you do drug it affects you in a negative way, you ether get thrown to jail, you damage yourself physically, or you can die. This is an example of cheating as an athlete and at life. Not making an effort to try doing things yourself and cheating you are not giving yourself the ability to show who you are inside. For example if you are a athlete and you do drugs/ steroids than you are not giving yourself the chance to improve yourself.