Firstly, I will say the quote can be summarized as self esteem. True self esteem is not based upon just good to oneself, but based upon accomplishment. No matter how down you are helping others put smile on their faces, irrespective of how Small thé help you render is e.g buying food for a begger, donating blood at a local blood drive, which is actually saving a life. This is an accomplishment. This feeling enable you to do more, because by lifting others you have also lifted yourself.