" We need the courage to START  and CONTINUE what we should do, and the courage to STOP what we shouldn't do."
                                   - Richard L. Evans 

I think this quote means that never give up something you want and don't let anyone let you down.Keep up what you dreaming for and never surrender. For example, being a doctor is your dream and you reaching to be a professional doctor one day. You tell your friend you want to be a professional doctor and your friends say to not be one. Don't listen to your friends , listen yourself because you know if you want to stop reaching your goal or you keep reaching your goal.