Aquinas on Natural Law in 2026

Thomas Aquinas wrote about natural law in the 13th century, but his insights remain remarkably relevant today. As we grapple with questions about artificial intelligence, genetic engineering, and digital ethics, Aquinas's framework offers a solid foundation for moral reasoning.

Natural law theory posits that certain principles of right and wrong are inherent in human nature and can be discovered through reason. Aquinas argued that these principles are not merely social constructs but reflect the structure of reality itself.

The First Principle

According to Aquinas, the first and most fundamental principle of natural law is simple: good is to be done and pursued, and evil is to be avoided. This might seem obvious, even tautological, but it serves as the foundation for more specific moral principles.

From this first principle, Aquinas derives secondary principles based on natural human inclinations: self-preservation, procreation and education of offspring, knowledge of truth, and living in society. These aren't arbitrary rules but reflect what it means to flourish as human beings.

Modern Applications

Consider the ethics of AI development. A natural law approach asks: What does this technology do to human flourishing? Does it enhance our capacity for truth-seeking, or does it undermine it? Does it strengthen social bonds, or fragment them?

These aren't questions about utility maximization or social consensus. They're questions about what we are and what we're for. Natural law provides a framework for asking these deeper questions that consequentialist and deontological approaches often miss.

The beauty of Aquinas's approach is that it's both rigorous and accessible. You don't need to be a theologian to grasp the basics, and yet the framework is sophisticated enough to handle complex modern dilemmas.

In an age of moral relativism and ethical confusion, perhaps it's time to revisit the wisdom of the past. Not to retreat from modernity, but to engage it with clarity and confidence.