"Associate yourself with men of good quality if you esteem your own reputation; for 'tis better to be alone than in bad company." by George Washington

This quote is trying to mean that you should stay away from people who do bad and stick to the kind that do good. Also that if others are doing bad things and your then only one who is doling good, then that is okay. For example if all your friends are convincing you to drink and smoke, you do not need to do it. Instead you should step up and say something or do something ctr related. The picture below is a sign of not smoking.