You've got to fight the human tendency to be selfish. You've got to fight the human tendency to be selfish.
People are basically selfish.
It is hard to live in a selfless way, doing things for other people, putting their needs before your own. Very few people can live selflessly for more than a small percentage of their life. It runs counter to the laws of nature, the survival of the fittest. But the highest level of evolution, the next meta level is to place survival of the group ahead of survival of the individual. We must work at this.