You are already familiar with natural theory, although you may not be aware of it. Universal ideas about fairness which cross cultural divides are an excellent example of natural law. Many children, for example, appeal to a sense of fairness in disputes, and most people around the world agree that murder is a severeinfraction of natural law. Many natural law theorists root their theory in the idea that all humans are essentially reasonable, and that their motives are driven by a sense of self preservation.

The origins of natural law theory lie in Ancient Greece. Many Greek philosophers discussed and codified the concept of natural law, and it played an important role in Greek government. Later philosophers such as St. Thomas Aquinas, Thomas Hobbes, and John Locke built on the work of the Greeks in natural law theory treatises of their own. Many of these philosophers used natural law as a framework for criticizing and reforming positive laws, arguing that positive laws which are unjust under the principles of natural law are legally wanting.

Many “natural rights” which are codified in legal language are also a part of natural law, although some theorists argue that humans may give up certain rights to live in society, for the better human good. However, basic tenets of equality and a desire to do good still remain. Some people also integrate religious beliefs into natural law theory, while others refer more generally to basic moral laws which may or may not be guided by religious faith.

To read More http://www.wisegeek.com/what-is-natural-law-theory.htm

Other Interesting Articles Weight Watchers Vs  Natural Weight Loss