Introduction Evolution has forced people to adopt different ways of life that will enable them to survive and accomplish their objectives. Natural ways of life have been displaced significantly by artificial trends that have become common in modern society. Constitutions have replaced natural laws, and people are now seeking justice from the courts and other similar institutions. However, it is important to understand that a constitution derives its legitimacy from natural laws that are based on religious and traditional values. This paper discusses three ethical principles that reflect natural laws that ought to be used to govern the behavior of human beings. Definition St. Thomas Aquinas defined natural law as all regulations that govern the relationships and behavior among human beings. The origin of this law is usually based on the practices of a community; however, they are applicable in all communities since they are based on human nature and not culture, race, nation or age. The ethical principles to be covered in this essay include the sanctity of life, noninterference in the affairs of other people and gossip. People have researched to establish the truth about life, but no one has ever found an answer for this mystery. This means that this phenomenon has challenged scientists and scholars since no one can present a report about it. However, there are principles that guide the relationships of people regarding life and death. The base of this discussion is that life cannot be repaired or recycled; therefore, this poses a significant challenge to policies and institutions that protect life. People must respect their lives, and no one should be allowed to kill another person regardless of the reason given to justify the action. Therefore, the death penalty violates natural laws that regard human life as sacred. Also, all forms of abuse that may lead to death or injury are a serious challenge to natural laws. People must conduct themselves in ways that will not cause death since nobody has a right to kill his friend, child, neighbor or relative. People should die because of unavoidable circumstances and not actions that are intentional. Secondly, people should live like brothers and sisters and avoid envying those that have excelled in various issues. They should understand that they cannot be equal since everybody has a talent, skill, knowledge, and experiences that are different from those possessed by others. Also, people have been brought up in different ways and taught different aspects that will make their lives bearable. For instance, a person cannot be a farmer, teacher, lawyer, doctor and mechanic at the same time since God gave people different talents; therefore, these differences should not create enmity among them. Lastly, gossiping is an unhealthy behavior exhibited by idle people. A society cannot develop if people are busy concentrating on the affairs of others. This means that a lot of time is wasted in gossiping, and this leads to low productivity at work. This behavior leads to conflicts among people since they feel betrayed when others speak negatively behind their backs. Therefore, people must avoid indulging in this behavior since it is retrogressive and affects human relations and productivity. Conclusion Natural