By Wenbin Yuan
From John Locke’s Natural Law to the Modern Foundations of Human Happiness
Two hundred and fifty years ago, human history did not hear thunder.
No divine revelation split the sky, no crown crashed to the ground with a resounding roar. There was no savior chosen by destiny, no epic hero sculpted by legend stepping forward to proclaim the dawn of a new age, no new great shining star down from the sky. On that day, the surface of the world appeared almost unchanged. And yet, in silence, the very foundations of civilization were pried loose.
A handful of “ordinary men,” nourished by Enlightenment thought in Europe and steeped in the spirit of ancient Greek philosophy and Roman law, wrote a single sentence on one piece of paper—a sentence so simple as to seem almost plain, yet radical enough at the time to challenge the deepest assumptions of civilization itself: “all men are created equal” as the greatest sentence ever written. That sentence became the starting point of the United States of America, and also the most dangerous, most demanding, most challenging, and yet most hopeful belief of the modern world for even today after 250 years of wars, revolutions, mass movements, intellectual debates, and legal battles. It did more than reshape political order; it opened an entirely new understanding of humanity’s ultimate question—happiness—triggering a profound and lasting revolution across philosophy, religion, and law.
Before the founding of the United States, nearly every human conception of power pointed upward, toward the heavens. Power was believed to come down from divinely heaven, or from God; God spoke through the Church; the Church crowned kings; kings ruled the people. In such a world, order depended on hierarchy, stability depended on obedience, and equality was never a point of departure—it was a dangerous heresy. Human beings were classified from birth: rulers and ruled, nobles and commoners, the chosen and the managed. People did not exist as persons, but as carriers of rank, status, and allegiance, and therefore endless of human suffering except a few on the top.
What John Locke accomplished was an intellectual reversal. He pulled power down from the heavens and returned it to the earth, shifting the foundations of politics from divine will or ideology to nature itself. Locke argued that before the existence of states, before churches and governments took shape, there already existed in nature a set of eternal laws not subject to human will. Prior to entering any society, human beings already possessed inalienable rights—life, liberty, and property. These rights were not gifts bestowed by power; they were facts of being human. Power could only recognize them, never create them.
At that moment, the meaning of government was fundamentally rewritten. The state was no longer a benefactor dispensing grace, but a trustee charged with care; politics was no longer a project to shape souls, save mankind, or command the masses, but a limited and restrained responsibility—to protect the rights that every person already possessed. When a government betrayed this responsibility, the people retained the legitimacy to alter or even replace it. This was not the rhetoric of revolutionary passion, but the natural conclusion of rational logic protected by the bill of rights from our treasured Constitution.
Running parallel to this political transformation was a religious revolution brought about by Deism. Deism did not deny the existence of God, but rejected the notion of a constantly intervening, partisan “tribal god” who favored certain peoples and endorsed rulers. In the deist understanding, God created the universe and its natural laws, then stepped back—returning the world to reason, entrusting morality to conscience, and placing responsibility in human hands, therefore people are responsible for their actions and consequences.
Within this vision, the world no longer depended on miracles to sustain order; morality no longer required authoritative decrees; faith no longer produced hierarchies. Dignity and mutual respect replaced obedience as the core value of human society. “All are equal before God” ceased to be merely a consolation of doctrine and became a foundation that secular institutions could bear. Thus, for the first time in history, church and state truly separated and one is responsible solely for one’s actions.
Deeply influenced by these ideas, Thomas Jefferson made a deliberate choice in the Declaration of Independence: he did not cite the Bible, but appealed instead to “the Laws of Nature and of Nature’s God.” It was a choice that appeared modest, almost understated, yet was profoundly revolutionary. It meant this: God does not stand with kings, nor with churches, nor with any political faction. God stands with natural law. From that point forward, sacredness was stripped from human authority, and power—for the first time—was compelled to bow before human reason and law.
Yet equality has never been a comfortable idea. It guarantees no equal outcomes, promises no smooth lives, and does not erase failure or suffering. On the contrary, it places responsibility squarely back on the individual. It removes the shelter of birth, dismantles excuses of destiny, and shatters the illusion of a life arranged by authority or divine interventions. In the end, all that remains is freedom—and a responsibility equal in weight to that freedom.
This is the paradox of equality: it liberates, and it burdens. The founders of the United States understood this well. They did not imagine an egalitarian society without conflict; they clearly foresaw that a society that truly acknowledges equality would inevitably be noisy, tense, and endlessly argumentative. Therefore, they did not attempt to mold “perfect citizens,” but instead designed educational institutions to restrain the weaknesses of human nature. Therefore, the ideal takes a long time to realize because education takes generations to change people.
The separation of powers was not meant to maximize efficiency, but to prevent any power from running unchecked. Freedom of speech was not meant to produce harmony, but to allow disagreement to surface. The rule of law was not valued for order alone, but to ensure that no one could stand above another. Within such a structure, there are no eternally correct leaders, no unquestionable truths—only a society in constant revision, and individuals forced to grow.
It is within this intellectual framework that “happiness” was rewritten. In premodern societies, happiness meant stability—land, status, attachment, and order. In the founding vision of the United States, happiness became a right: the equal moral footing for the pursuit of happiness. The Declaration of Independence did not promise happiness itself; it recognized and tried to protect only the legitimacy of pursuing it. It does not guarantee success, but permits the attempt; it does not define the destination, but preserves direction. Happiness is no longer a reward distributed by society, but a possibility opened by freedom.
For 250 years, the United States has never fully realized equality. Slavery was once deeply embedded; racial segregation once stood as law; women were long excluded from political rights; American Indians and minorities still struggle for full legal protection. These histories cannot be avoided, nor should they be disguised.
Yet precisely because equality was written into the nation’s intellectual foundation as part of its DNA and seed to grow, American history has never been a straight line, but a continuous process of self-correction. Its greatness lies not in never having erred, but in retaining the capacity to acknowledge mistakes and correct them. Dissent is not a crack in the system; it is proof that the system is still breathing.
On the 250th anniversary of the founding of the United States, we stand once again at the beginning. Equality is not a completed achievement, but a responsibility without an endpoint. It demands vigilance against the temptations of power, resistance to the allure of comfort, and a continual reminder that no one is born entitled to stand above another and everyone has an obligation to protect one’s basic rights.
Natural law has not aged. Deism has not faded. “All men are created equal” remains the most radical—and the most unsettling—belief of modern civilization. Two hundred and fifty years ago, it was written on paper. Two hundred and fifty years later, it continues to test every generation’s understanding, its social responsibility, and the philosophical and religious foundations upon which true happiness can be attained.
This is the truly profound meaning of America’s idea that all men are created equal.