How to keep going when we want to give up?

Is not matter who we are or what we are doing, there are times when we feel down when things feel hard when things feel tough and we want to give up. Successful individuals have the same problems too. They also experience times when they feel low, trapped in life and want to quit. The only variance between successful individuals and normal individuals lies in how they deal with this kind of situation. Can you guys tell me how to keep going we want to give up?