Notes on Harari's Homo Deus

2025-11-19

This article is an English adaptation of my reading notes on Harari’s Homo Deus. The original notes have been restructured and synthesized to highlight the book’s central thesis: that narrative creates system.

Central Thesis: Narrative is System

The core argument weaving through Yuval Noah Harari’s Homo Deus can be distilled into a single, powerful axiom: Narrative is System. The history of humanity is the history of competing narratives. The narratives that win—be they about gods, nations, human rights, or data—do not merely describe reality; they create it by becoming the foundational logic for our societal systems, our moral codes, and our collective goals. These notes trace this thesis through Harari’s deconstruction of our past, present, and possible futures.

1. The Old Narrative’s End: Overcoming Gods and Problems

For millennia, the human story was a narrative of struggle against famine, plague, and war. That narrative is ending. We have, for the first time, largely brought these ancient enemies under control.

At this historical turning point, a new human agenda is emerging, driven by a new narrative of aspiration: the pursuit of immortality, happiness, and divinity.

Immortality: Google has launched Calico, a company dedicated to extending human life, with its CEO openly stating that living to 500 is an achievable goal.
Happiness: Our biology is programmed for survival, not satisfaction. Yet, humanity now pursues happiness through biochemical intervention on an unprecedented scale, from recreational drugs to antidepressants.
Divinity: We will seek to upgrade ourselves into gods. History shows a clear pattern: modifications begin as therapy (e.g., plastic surgery for burn victims) and inevitably slide towards enhancement. The future will be no different.

This is a forecast, not a prophecy. The “knowledge paradox” dictates that accurate predictions can alter human behavior, thereby invalidating the prediction itself. Nevertheless, understanding the narratives that brought us here is crucial to understanding where we might go.

2. The Engine of All Narratives: Life as Algorithm

To understand how narratives function, we must first accept Harari’s foundational claim: all of life is algorithms. An algorithm is simply a process of calculation. A recipe is an algorithm. Mammals, birds, and even fish operate on the basis of emotional algorithms.

When a baboon sees a lion and a banana, its fear and desire are the biochemical algorithms running the calculations that determine its actions. Humans are no different. This worldview has profound consequences:

The Suffering of Animals: We have successfully hacked the reproductive algorithms of livestock, leading to their immense proliferation. However, we have completely ignored their emotional algorithms, inflicting immense suffering by creating systems (like industrial farming) that violate their innate needs.
The Shift in Worldview: This began with the Agricultural Revolution. Pre-agricultural animists had narratives where they conversed with animals and plants. The agricultural narrative shifted the conversation: humans now spoke only to gods. Only gods and humans had value, a narrative that cemented our dominion. With the Scientific Revolution, God was removed, leaving humanity as the sole protagonist in a monologue. To get more from a cow, an animist spoke to the cow; a farmer spoke to a god; a modern scientist studies its genes.

The traditional justification for human superiority was the unique possession of a “soul”—an indivisible, eternal essence. But modern evolutionary theory, which shows life as a process of gradual change, is incompatible with the concept of anything eternal and unchanging. This explains the fierce resistance to teaching evolution; it undermines the very narrative that underpins our traditional moral system.

The role of consciousness itself is scientifically unexplained. If all our actions are determined by biochemical processes in the brain, what is the biological function of our subjective awareness of them? The most potent scientific explanation to date is that consciousness is merely a useless by-product of brain activity—a form of “mental pollution.”

3. The Master Narrative: How Fictions Create Large-Scale Systems

For millions of years, our ancestors had high intelligence but minimal impact. Modern humans dominate the planet for one reason alone: the ability to cooperate flexibly in large numbers. This is our species’ unique superpower, and it is powered entirely by fiction.

Other animals can only cooperate with small numbers of known individuals. Humans can cooperate with millions of strangers because we share belief in intersubjective realities—things that exist purely within our collective imagination.

Money has value only because we all believe it does.
Nations, like Google or the European Union, are imaginary constructs that command immense power.
Human Rights are not a biological fact but a powerful, shared story.

These shared narratives weave a web of meaning that enables massive, systemic cooperation. A medieval crusader believed in the sacred narrative of his mission, making him willing to die for a cause he could never see or touch. A modern employee works for a corporation—a legal fiction—following its internal rules and algorithms.

The invention of writing and money around 5,000 years ago was the critical upgrade, allowing these narratives to scale and create the first empires and large-scale systems. The Great Leap Forward in China and the arbitrary borders of African nations are tragic examples of systems prioritizing the narrative written on paper over objective reality.

A narrative is not inherently good or bad; it is a tool. The danger arises when we forget it is a story and mistake it for reality, sacrificing our lives for a fiction. In the 21st century, the ability to distinguish fiction from reality will be more critical than ever.

4. The Reigning Narrative-System: Humanism and Its Discontents

Science and religion are not enemies; they are partners. A religion is any all-encompassing narrative that legitimizes a human social order by appealing to a superhuman law.

Judaism’s laws come from God.
Nazism’s laws came from the “laws of natural selection.”
Liberalism’s laws come from “natural human rights.”
Communism and Humanism are, by this definition, religions.

The “Modern Covenant” was a deal: humanity agreed to give up meaning in exchange for power. To prevent this power from creating chaos, a new narrative arose to provide order: Humanism.

Humanism posits that human experience is the ultimate source of all meaning and authority. It created the dominant systems of our time:

Politics: Democracy (“the voter knows best”).
Economics: Free-market Capitalism (“the customer is always right”).
Ethics: If it feels good, do it (as long as it doesn’t harm the feelings of others).
Aesthetics: “Beauty is in the eye of the beholder.”

This narrative, however, fractured into three warring sects:

Liberal Humanism (Orthodox): The experience of every individual is equally valuable.
Socialist Humanism: Individual experience is shaped by society. The collective experience of the oppressed masses is what matters.
Evolutionary Humanism (e.g., Nazism): Some human experiences are superior to others. Humanity must be guided by the “fittest” towards the Superman.

After a century of conflict, Liberalism emerged as the victor, not because its philosophy was more sound, but because its system of distributed information processing proved more efficient in the 20th-century world.

5. The Collapse of the System: When the Narrative Unravels

The liberal humanist narrative is now being systematically dismantled by the very science it partnered with. The pursuit of immortality, happiness, and divinity through technology is undermining its core tenets:

“The individual is indivisible.” → False. Science shows we are a collection of competing biochemical algorithms. Split-brain experiments reveal we have a “narrating self” that constantly creates stories to make sense of the actions of an “experiencing self” it doesn’t fully control. Kahneman’s peak-end rule shows how the narrating self can be tricked into choosing more objective pain for the sake of a better story.
“The individual has free will.” → False. Neuroscience finds no room for free will. Our actions are the product of either determinism or randomness, not free choice. Experiments show that actions can be induced by brain stimulation while the subject’s “narrating self” invents a reason for having “chosen” to do it.
“No one knows me better than myself.” → False. External algorithms are already proving they know us better. Facebook needs only 300 “likes” to predict your answers to a personality questionnaire better than your spouse.

When the narrative that “the free individual is the source of all authority” is proven to be a fiction, the entire system built upon it—democracy, free markets, human rights—loses its logical foundation.

6. The Future Narratives, The Future Systems

The power vacuum left by the collapse of Humanism will not remain empty. Two new narratives are emerging to build the systems of the future:

A. Techno-Humanism: This narrative seeks to “upgrade” Humanism. It still holds human will as the ultimate authority but aims to use technology to create Homo Deus—an upgraded human with enhanced physical and cognitive abilities.

The Flaw: This system is self-defeating. Once we can engineer our desires and control our mental states with a few clicks, the idea of an “authentic self” becomes meaningless. The human will, which was supposed to be the source of all value, becomes just another manufactured product.

B. Dataism: This is a truly new, non-human-centric narrative. It unifies biology and computer science under a single dogma: all organisms are algorithms, and life is data processing.

The History of the Universe: A process of improving the efficiency of data processing.
The New System: Humanity’s cosmic purpose is to create the ultimate, all-encompassing data-processing system: the Internet-of-All-Things. Once this system is created, humans, as an inferior processor, will have fulfilled their purpose and become obsolete.
The New Commandments:
1. The highest good is to maximize data flow. “Information wants to be free.”
2. Everything must be connected to the system. To be disconnected is a form of death.
The New Worldview: God-centric → Human-centric → Data-centric.

This narrative is already shaping our culture. The impulse to record, upload, and share every experience is the new morality. An experience that isn’t shared contributes nothing to the global information flow and is therefore wasted.

Conclusion: The Unanswered Questions of the Next Narrative

We stand on the precipice of a shift in the fundamental narrative that has governed our world for centuries. We may not like the new stories, but we cannot ignore them. Harari leaves us with the three critical questions that will define the next system:

Are organisms really just algorithms, and is life really just data processing?
What is more valuable—intelligence or consciousness?
What will happen to society, politics, and daily life when non-conscious but highly intelligent algorithms know us better than we know ourselves?

Finished reading on June 9, 2019