Final answer:
The eternal law of Thomas Aquinas is one of the four types of laws proposed by the philosopher. It governs the universe and reflects the divine order.
Step-by-step explanation:
The eternal law of Thomas Aquinas is one of the four types of laws proposed by the medieval philosopher. According to Aquinas, eternal laws govern the universe and exist independently of human society. They are the laws that reflect the divine order and are unchanging. For Aquinas, these laws are known through divine revelation rather than human reason alone.