Conflicts often arise between secular conceptions of justice or morality and divine law.   For Aquinas, human laws derive from natural law, which is participation in eternal law.  Therefore, the eternal law is at the top, followed by natural law and then by human law. Divine law is God`s revealed law for man, while natural law is the imprint of eternal law in the hearts of men. It is „natural“ because it consists of the reason given to us by the „higher reason“ of the divine legislator.  They are natural because they are objective principles that have their origin in human nature (GS 16; DH 14).  The law of nature is universal because it embraces every human being, every epoch (cf. KKK 1956): „It is immutable and permanent throughout history; the rules they express remain essentially valid“ (CEC 1958). Moreover, divine law comes only from God, while natural law is a set of intrinsic values in man. Natural law involves reasoning and intrinsic values, while divine law involves devotion. The New Law perfects the Old Law. The New Law commands inner behavior through Jesus` teachings—and reaches us through divine love—and promises heavenly love and rewards. The New Law „is the Holy Spirit given by faith to Christ, who heals and expresses himself through love.“  He gives strength to the inner being to realize what he teaches. It is also a written law that can be found in the teachings of Christ (in the Sermon on the Mount, the Beatitudes, etc.) and in the moral catechesis of the Apostles, summarized in the Commandment of Love.  In Thomas Aquinas` treatise on the law, god`s law comes only from revelation or Scripture, that is, from biblical law, and is necessary for human salvation.
According to Aquinas, god`s law should not be confused with the law of nature. Divine law is primarily and mainly a natural law, but it can also be a positive law. [Citation needed] „The law is a decree of reason for the common good, proclaimed by him who is responsible for the community“ (Thomas Aquinas, STh I-II, 90, 4; CCC, 1976). The law is first and foremost a reasonable plan of action, „a certain rule and measure of actions in which man is induced to act or prevented from acting“ (S.t., 1-2, q. 90, aa. 1, 3; S.c.g., 3, 114). Eternal law is god`s divine wisdom that oversees the common good and governs everything. Eternal law is God`s plan to lead all creation to God`s eternal plan of salvation in order to be holy and blameless before Him through Jesus Christ (Ephesians 1:4-5). God as „Being Himself“ is able to proclaim such a law, since God`s reason, the Creator, is also perfect wisdom. Everything in nature reflects the Eternal Law in its own nature (S.T. I-IIae, 91, 2). Things act according to their nature so that they draw their own purposes (the ultimate cause) according to the law inscribed in their nature.
Divine law may differ from religion to religion, but natural law is constant throughout the world because it is based on human nature. The concept of natural law is not modern. In fact, it dates back to the time of Aristotle and Plato. Since natural law is based on human nature and not on culture or traditions, it is constant all over the world. For example, all societies consider murder to be morally reprehensible, regardless of how it is perceived by religion or court law. The law of nature is „the participation of the rational creature in the eternal law“ (ST I-II, Q. 91, A. 2.). The highest standard of human life is the divine law—eternal, objective, and universal—with which God governs us according to His wisdom and love.
God makes man a participant in His law so that man may know the unchanging truth“ (DH 3). The law of nature „depends on god`s desire and submission to Him, as well as on the feeling that the other is equal“ (CCC 1955). Belief in the divine in the law is not common in a religion. Almost every religion in the world has this type of law. According to Thomas Aquinas` treatise on the law, God`s law comes only from Revelation or Scripture; Therefore, Christians can call it biblical law. In addition, we also call it the „Word of God.“ Other religions also have their own divine law; The Holy Quran and the Codex of Hammurabi are two examples. Religious law, like canon law, includes both divine law and additional interpretations, logical extensions, and traditions.  Natural law is a theory that suggests that there are a number of rights inherent in existence and different from man-made legal systems. It also suggests that humans possess intrinsic values that guide their reasoning and behavior. According to natural law, the rules that determine the correctness or falsity of action are inherent in man. These are not created by the company or a court.
Moreover, this theory contradicts the idea that laws are created by humans or socially constructed. God`s law is any law or rule that is believed to come directly from God. This is God`s law. In addition, people generally consider divine law to be superior to natural law or secular law. Those who believe in divine law believe that divine law has more authority than other laws. Moreover, they believe that it cannot be changed by humans or human authorities. Therefore, the main characteristics of divine law are 1) it is universal and permanent, 2) created by a supreme being, 3) and leads people to become good. According to Chaniotis, divine laws are known for their apparent inflexibility.  The introduction of interpretation into divine law is a controversial subject, as believers attach great importance to strict observance of the law.
 Opponents of the application of divine law generally deny that it is purely divine and point to human influences in the law. These opponents characterize these laws as belonging to a certain cultural tradition. Followers of divine law, on the other hand, are sometimes reluctant to adapt inflexible divine laws to cultural contexts.  Medieval Christianity assumed the existence of three types of laws: divine law, natural law, and man-made law.  Theologians have essentially debated the scope of natural law, with the Enlightenment promoting a greater use of reason and expanding the scope of natural law and marginalizing divine law in a process of secularization.  [Additional Citation(s) Required] Since the authority of Divine Law is rooted in its source, the origins and history of the tradition of Divine Law are important.  [a] Divine law and natural law are ancient concepts and date back to the Middle Ages. Both are immutable laws that govern human behavior.
Divine law and natural law are ancient concepts and date back to the Middle Ages. The main difference between divine law and natural law is that divine law comes directly from God, while natural law is inherent in man. Divine law encompasses any body of law that is perceived as coming from a transcendent source, such as the will of God or the gods – as opposed to man-made law or secular law. According to Angelos Chaniotis and Rudolph F. Peters, divine laws are generally perceived as superior to man-made laws, sometimes because of the assumption that their source has resources beyond human knowledge and reason.  Believers in divine laws can give them more authority than other laws, for example, assuming that god`s law cannot be changed by human authorities.  Human law is the interpretation of natural law in different contexts (ST II.I.95-97).