Thomas Aquinas is one of the classical Natural law theorists whose theories are inspired by Aristotle and Augustine. However, unlike Aristotle, who pre-dated Christianity itself, Aquinas marries Aristotle’s theory of rationalism with Christian tradition. He believes man, because he possesses reason, to be a participant in divine wisdom whose purpose is to live in a flourishing Christian community. Much like Aristotle’s theory, Aquinas’s also possesses a teleological approach, in that he focuses more on an idealistic end goal and what a perfect legal system ought to be. He argues that law is a necessary institution in a community and just laws will reflect directly (specifiato) or indirectly (determinato), the universal morality of natural law. The fact that he considers law to be an essential part of a society indicates that his theory is concerned with stability because law is needed to regulate the society. In his attempt to explain what law is, he divides law into four categories; eternal law, which is concerned with the laws of nature such as gravity, divine law which is contained in Holy scripture like Bible, natural law which is discovered through human reason and human law which is an amalgamation of divine law and natural law. He also categorizes truth to be of three kinds: divine truths, truths that man can discover through speculative reason and truths that man can discover through practical reason and it is upon the basis of these truths that there can be order in society as these truths will lead man to exercise correct judgement. For Aquinas, a human law would be unjust where it furthers the interests of the law-giver only, exceeds the power of the law- giver and imposes burdens unequally on the government. Like Augustine before him, he believes that an unjust law is no law. However, interestingly enough, he states that this does not give a license to the public to disobey the law because, disobeying the law would lead to anarchy and upheaval of the natural order of things. He states that unless the Church steps in and declares a law invalid, it is the duty of the public to follow it. Practically speaking, in the time that Aquinas lived, it is not everyday that the Church would step in to interfere in the legal systems of other States as that would usually lead to war. Thus, the statement above rings true; Aquinas’s theory concerns itself with political stability and order to the extent that at some places, it contradicts itself and risks being called insincere towards natural law. Hans Kelsen criticises this approach because of the inconsistencies present within it.