Is derived a combination of both the Divine and Natural Laws and must be directed toward the common good. Such law can vary in accordance with time but its essence must be just as an unjust law is not law (lex injusta non est lex). For Aquinas an unjust human law is one that furthers the interests of the lawgiver solely; or exceeds the power of the lawgiver; or imposes unequal burdens on the society being governed. Under this rationale therefore, Aquinas held the belief that disobedience to an unjust law becomes a duty as if the law is contrary to Divine law, man is released from obedience – we should obey God rather than man. However such disobedience should be avoided if it were to lead to social instability, which is a greater evil than the existence of an unjust law in the first instance.Aquinas was concerned with the nature of laws primarily rather than the nature of a legal system or how laws operate. John Finnis, as will be seen later, was concerned with both equally. Law, according to Aquinas, is the use of reason for the common good made by those that care about the community and made known to this community. Aquinas believed that God gave humans characteristics the primary of which was our capability for rationality and reason. Mankind tends to do things naturally thus mirroring God as supremely rational. Using reason and rationale we can deduce what is self-evidently good and worth pursuing or what is self-evidently bad or evil and to be avoided. In this pursuit of good things we make laws for the common good using reason and are, again according to Aquinas, participating in God’s rational world order.