Thomas Aquinas's Summa Theologica: Natural Law, God, and Society
The Summa Theologica and Natural Law
The Summa Theologica analyzes natural law, concluding that this law is generally applicable to all people but may vary in particular applications.
Eternal Law and its Manifestations
The eternal law of God is manifest in all beings. In the physical realm, it is seen through natural law. In human affairs, it is understood through reason. All beings are governed by this law, manifesting in living things through the drive for self-preservation, reproduction, and education. For humans, it also includes the search for truth and living in accordance with it.
Natural Law, Reason, and Virtue
Although natural law is a human principle, it is imprinted on the soul, allowing individuals to assimilate these habits habitually. If guided by reason, one becomes virtuous. This aligns with synderesis, the innate human inclination to seek good and avoid evil.
Natural Law and Revealed Truths
Natural law, understood through reason, falls within the scope of revealed truths, yet it does not conflict with faith. Thomas Aquinas, in the Summa Theologica, analyzes reality theologically, beginning with God, then the world, and finally, humanity's knowledge of it.
Aquinas's Proofs for God's Existence
The Five Ways
Thomas Aquinas demonstrates the existence of God through his Five Ways. Starting from empirical experience, he traces back to the ultimate origin. He concludes that God is the necessary, perfect, and universal creator of order.
God's Uniqueness and Human Creation
Ethics and Virtue in Human Action
Once God's existence is demonstrated, Aquinas addresses the uniqueness of God. He states that God is unique perfection, whose essence includes existence. Other beings do not necessarily exist; they only participate in the existence granted by God through creation. In creation, a human substance is composed of matter and form, enabling the knowledge of essential realities by abstracting their aspects. Through voluntary actions, humans can develop ethical, moral, and political virtues, thereby developing natural law and avoiding vice, leading to salvation.
Natural Law in Politics and Governance
The Necessity of Written Law
Natural law is also manifested in politics. Knowledge about certain individuals does not necessarily hold true for everyone, as there may be unknown truths. Therefore, written law became necessary to complete specific rules and guide concrete behavior, preventing deviations from what is right.
The Common Good and Monarchy
The Role of Church and State
For Thomas Aquinas, the common good differs from that of the rational Greeks because it is subordinated to reason and religion. Politics, therefore, is assessed by reason through religion. Aquinas particularly favors monarchy, which mirrors God's monarchy over the world, with the Church as its representative on Earth. Although the government holds power, it is bound by God to prevent abuses.