Physics Has a Theory About Why You Shouldn't Cheat

Why is there such a thing as right and wrong? You would not expect the answer to start in a physics textbook, in the law that explains why ice melts in a warm room.

Philosophers have offered answers for thousands of years: God's command, human reason, social contracts, evolved instinct. I did not expect to find a new angle in a physics concept. But one evening, thinking about entropy, a chain of reasoning came together so cleanly that I wondered why nobody had shown it to me in school.

The chain has a few links. It runs from the second law of thermodynamics to scarcity, from scarcity to game theory, and from game theory to a question physics cannot settle for you: why you should cooperate when cheating pays. I'll take it one link at a time.

Step One: Order Is Rare

Entropy, roughly speaking, measures how many ways the parts of a system can be arranged without changing how it looks overall. There are vastly more messy arrangements than tidy ones, which is why things drift toward mess. Shuffle a deck of 52 cards and there are about 8 × 10⁶⁷ possible orders; you will essentially never get it back in sequence.

In our universe, the tidy, concentrated, energy-rich states are the rare ones. A charged battery, a ripe apple, a tank of fuel, a field of wheat. These pockets of usable energy are scarce compared with all the ways energy can be spread thin and useless.

This is how I put it to myself:

"Highly ordered states are statistically rarer, and in our spacetime more energy dense. Thus there is competition due to entropy. Thus game theory and morality is born."

Step Two: Scarcity Creates a Game

If useful energy is scarce, every living thing faces the same problem: get enough of it before someone else does.

That is a game in the mathematical sense, a situation where your outcome depends on what others do. And games of this kind have two basic moves. You can cooperate, sharing and coordinating so that everyone does better together. Or you can defect, grabbing what you can for yourself at someone else's expense.

Game theory has studied this for decades. One of its most famous results came from computer tournaments run by the political scientist Robert Axelrod around 1980, in which strategies competed in repeated rounds of the prisoner's dilemma. A very simple strategy called tit for tat, which cooperates first and then copies whatever the other player did last time, did remarkably well. Cooperation can win, but only when players meet again and remember.

Step Three: Defection Wins Locally, Loses Globally

Look across the sciences and the same pattern shows up again and again.

Cells cooperating become organisms. A cell that defects, growing for itself and ignoring the body's signals, is what we call cancer. It wins locally for a while and destroys the whole. People cooperating become families, towns, nations, civilizations. Empires tend to rise on cooperation and crumble when enough of their members start serving only themselves.

Defection gives you a local gain at a global cost. Cooperation often costs you something locally and produces a global gain. That is my working definition of the framework of morality: the space of choices between those two moves, created by scarcity, created by entropy.

The Hard Part: Why Should I?

Here I had to be honest with myself.

Explaining why morality exists is not the same as explaining why anyone ought to be moral. If defection pays locally, and you can get away with it, why not? Plenty of people grab, win and die comfortable. Physics does not punish them.

I don't have a knockdown answer, and I don't trust anyone who claims to. What I have is a leap of faith, and I want to name it as one.

The leap is that reality is fundamentally connected. Quantum entanglement produces correlations that do not weaken with distance. Many physicists suspect that space and time themselves emerge from something more unified. And the ancient traditions, from the Upanishads to the Gospels, say the same thing in their own language: the many come from the One.

If that is true, cooperation is not just a clever strategy. It is alignment with how things actually are. Defection is a bet on separation, and separation is the illusion.

Morality Isn't Black and White

This also explains why morality feels grey in practice. Cooperating with everyone, always, is not good either: your immune system has to attack rogue cells, or the body dies. Tit for tat itself retaliates. Morality behaves less like a list of rules and more like a wave that responds to scale. What is right for the cell, the family and the species can pull in different directions.

The biologist Michael Levin talks about an agent's "cognitive light cone," the size of the goals it can care about. The larger yours is, the more obvious it becomes that cooperation lines up with the structure of reality.

Where Free Will Comes In

The last piece is the one I find most beautiful.

If defection were always punished cosmically, being good would just be self-interest under threat. There would be no real choice. If nothing were ever at stake, there would be no reason to choose either. What is left is a genuine freedom: you can defect and get away with it.

That freedom is what makes the choice to cooperate meaningful. And the best reason I have found to make it is not fear. It is what happens once you really see that everything is connected:

"So one cooperates not out of fear of defection, but out of awe and alignment with the beauty of the true nature of reality and the whole."

To me that is the heart of the move from law to love that runs through the New Testament. Law says: cooperate or be punished. Love says: cooperate because you finally see that the other was never really other.

Scarcity and the Choice

Entropy made the game. Scarcity made the temptation. The choice is still yours.

So the next time you are tempted to take the local win, more for you and less for them, which picture of reality are you betting on: one where everyone is separate, or one where everything is connected?