Living harmoniously means; an accord, in conformity with articulation, compatibility, integration, togetherness, and in unity with friends who also live in harmony. Through the centuries, the subject of harmony, or happiness, was debated as part of ethics; the philosophical study of the nature and grounds of moral thought and action. Ethical theories in this pure sense are sharply distinguished from moral systems, which are directed towards drawing up particular sets of rules by which to live, and from practical or applied ethics, the analysis of arguments advanced for particular moral conclusions. The most fundamental question in ethics is usually taken to be the justification of morality that is whether or not it can be demonstrated that moral action is rational. With all the enlightenment based on the results of modern scientific research and the new model of literature; fiction and poetry, the need for a harmonious living and happiness still remains unchanged - ever since the ancient times.