Natural law is a philosophical and legal theory that posits inherent, universal principles derived from nature and reason, going beyond human-made laws. From Aristotle’s concept of natural justice to Stoic claims of a rational cosmic order, thinkers have viewed it as a moral guide shaping human behavior. Thomas Huxley highlighted its unchanging structure, while Elisha Gray broadened it to encompass the spiritual aspects of human existence.
Lysander Spooner based it on everyday principles of property and agreement. Combining these viewpoints, natural law appears as a lasting framework connecting reason, ethics, and the universe, challenging positivist perspectives by affirming objective criteria rooted in human nature and universal causality.