Have you ever known someone who seemed always to be helping others? These people are so accustomed to doing unselfish acts, that it takes almost no effort for them to pitch in and help. Their bodies and minds do it automatically.
These same people generally are very generous givers, not only with monetary donations, but giving of their time and resources. They do it without thinking of whether they SHOULD, or if it is even reasonable. It is part of the fabric of which they are made.
I have known a number of people who are like this. It is very honorable, even enviable be this kind of person, where kindness and generosity are so ingrained that these acts represent the very essence of who they are. They aren’t doing only what is expected of them; they do more than what is required.