According to Aquinas, the supreme rule of nature is that "good is to be done and pursued and evil avoided." According to Aquinas, reason exposes specific natural laws that are beneficial for people, such as the need to know God, desire for marriage and family, and self-preservation.
The four sorts of law that make up Aquinas' Natural Law Theory are Eternal Law, Natural Law, Human Law, and Divine Law.
An ordinance of reason for the common welfare, created by the person responsible for the community and promulgated, is how Aquinas describes a law. Law is a rational ordinance because it must be reasonable or grounded in reason, not just the legislator's wish.
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