In Meditations, Marcus Aurelius mentions that there are 3 kinds of people: 1.) who help someone and immediately look for reciprocity 2.) who are slower to look for something in return but who feel like the person owes them something 3.) who, like a vine which bears grapes each season, move from one good task to another without expecting anything in return. If we believe that we must be aware of the good we did and also make the person whom we helped aware of it, he believes we belong to the 1st category. Our duty is to be part of the 3rd category — help people without expecting anything in return.