The Case for Reason: 5 Core Ideas from Steven Pinker and Sam Harris

November 15, 2025

In an age of misinformation and tribalism, how do we find the truth? For decades, cognitive scientist Steven Pinker and neuroscientist/philosopher Sam Harris have championed one answer: Reason.

They are two of the world’s most prominent public intellectuals, arguing for a worldview based on Enlightenment values, scientific evidence, and humanism. Let’s explore five of their shared, core ideas that provide a toolkit for clear thinking.

Ideas That Shape Us

Key concepts from Steven Pinker & Sam Harris on progress, morality, and human nature.

Idea 01

The Power of the Enlightenment

“[The Enlightenment] has worked: The world is about 100 times wealthier than it was two centuries ago…”

Pinker argues we are “ungrateful” for the modern world. Enlightenment values—reason, science, humanism—built modern medicine and democracy. We must defend them.

Idea 02

The Case Against Faith

“Faith is the permission religious people give one another to keep believing things in the absence of evidence.”

Harris critiques “faith” as a “conversation-stopper.” He argues humanity’s future depends on embracing evidence-based reasoning for our most important beliefs.

Idea 03

The Science of Morality

“A concern for the well-being of conscious creatures… is the only rational basis for morality.”

Harris argues morality isn’t opinion; it’s science. “Good” is whatever increases the well-being of conscious creatures. Moral truths exist like scientific truths.

Idea 04

Understanding Human Nature

“If you believe that all differences among people are skin-deep… you are likely to be baffled when conflicts erupt.”

Pinker rejects the “Blank Slate.” We are born with a complex, evolved human nature. To build a better world, we must design systems that account for our inherent biases.

Idea 05

The Illusion of “Free Will”

“You can do what you decide to do — but you cannot decide what you will decide to do.”

Harris argues the conscious “self” is an illusion. Our thoughts emerge from background causes we don’t control, challenging the traditional notion of free will.

Pinker and Harris are essential guides for the 21st century, offering a powerful, evidence-based framework for thinking about the world and our place in it.

If you enjoyed this exploration of their ideas, it was inspired by the full collection in our book, 371 Steven Pinker and Sam Harris Quotes. You can find all 371 insights in our complete volume, available now on Amazon.

Check out our top titles on amazon!

Reason tells us that the world is getting better, but our brains are wired to focus on the negative. To understand the evolutionary origins of this cognitive bias, we must look at Darwinian Aesthetics.

1. Idea: The Power of the Enlightenment

“[The Enlightenment] has worked: The world is about 100 times wealthier than it was two centuries ago, and the first global … decline in violence has been documented.” – Steven Pinker

Pinker’s central thesis is that we are “ungrateful” for the very system that gave us our modern world. He argues that the Enlightenment values of reason, science, and humanism are responsible for everything we cherish: modern medicine, human rights, democracy, and unprecedented peace and prosperity. His work is a call to defend these values, not abandon them.

2. Idea: The Case Against Faith

“Faith is the permission religious people give one another to keep believing things in the absence of evidence.” – Sam Harris

Harris is famous for his sharp critique of faith. He argues that “faith” (belief without, or in spite of, evidence) is not a virtue but a “conversation-stopper.” He believes that it’s a flawed and dangerous way to make decisions, and that humanity’s future depends on embracing evidence-based reasoning for all of our most important beliefs.

3. Idea: The Science of Morality

“A concern for the well-being of conscious creatures… is the only rational basis for morality.” – Sam Harris

This is one of Harris’s most famous (and controversial) ideas. He argues that morality is not just “opinion.” We can, and should, use science to determine what is “good.” He argues that “good” is that which increases the well-being of conscious creatures, and “bad” is that which causes suffering. Therefore, we can have “moral truths” in the same way we have scientific truths.

4. Idea: Understanding Our (Flawed) Human Nature

“If you believe that all differences among people are skin-deep… you are likely to be baffled when… conflicts erupt.” – Steven Pinker

Pinker, a cognitive psychologist, argues against the “Blank Slate” theory (the idea that we are born as empty vessels). He shows that we are born with a rich, complex, and flawed human nature, shaped by evolution. To build a better world, we can’t ignore this nature (our tribalism, our biases); we must understand it and build systems that compensate for it.

5. Idea: The Illusion of “Free Will”

“You can do what you decide to do — but you cannot decide what you will decide to do.” – Sam Harris

This is a challenging concept. Harris argues that the conscious “self” is not the true author of our thoughts and actions. Our thoughts simply “appear” in our minds, produced by prior causes we don’t control. He argues that “free will” is an illusion. But, he says, understanding this illusion should make us more compassionate, as it removes the logic for hatred and blame.