The author considers some problems such as relativism and moral subjectivism, religion and its relations with morality, the ethical and psychological selfishness of people, at the same time that he shows us some very important normative theories, such as Kantianism, utilitarianism, ethics.

He is someone who looks out impartially for the interests of everyone who is affected by his actions, someone who carefully distinguishes facts and evaluates their implications, someone who accepts principles of conduct after carefully analyzing them to be sure that are concrete, be willing to listen to reason even when it means for him to have to review his own previous convictions and finally be willing to act on the consequences of his consideration.

Within the chapter of ethical egoism, it is discussed how people act in or carry out their activities in a disinterested way.

Community work, donations, foundations and social service work are many examples of people who act in a disinterested way always thinking of helping their neighbor, however in this chapter a theory of human nature called "psychological selfishness" is mentioned in which tells us that no one is capable of acting disinterestedly since the aforementioned is an illusion and all people act always thinking in themselves.

The book has been translated into Italian, Portuguese, Chinese, Indonesian, Korean, Spanish, Norwegian, Swedish, Persian and Albanian.