The Stoic Roots of CBT: How Epictetus Became Albert Ellis

In 1955, a psychologist named Albert Ellis proposed a radical reframing of how therapy should work. The prevailing assumption was that emotional disturbance came from traumatic events — from what had happened to a person. Ellis argued that this was wrong. Disturbance came not from events but from beliefs about events — from the interpretations and judgments a person attached to what happened.

He called his approach Rational Emotive Therapy, later Rational Emotive Behavior Therapy (REBT). It became one of the foundational frameworks of what is now cognitive behavioral therapy (CBT), the most widely practiced evidence-based therapeutic approach in the world.

Ellis was explicit about his source. He was not inventing a new idea. He was recovering an old one. The philosopher he cited was Epictetus.

What Epictetus Actually Said

The passage Ellis returned to most often is from the Enchiridion, the handbook of Stoic practice compiled by Epictetus's student Arrian:

"Men are disturbed not by the things which happen, but by the opinions about the things: for example, death is nothing terrible, for if it were, it would have seemed so to Socrates; for the opinion about death, that it is terrible, is the terrible thing."

— Epictetus, Enchiridion, 5, trans. Elizabeth Carter

This is not a metaphor. Epictetus is making a precise philosophical claim: the cause of emotional disturbance is not the event but the judgment attached to the event. The same event — death, loss, failure, rejection — can produce wildly different emotional responses in different people. The variable is not what happened. The variable is what a person believes about what happened.

Ellis's ABC model operationalizes this exactly. A is the Activating event. B is the Belief — the interpretation, the judgment. C is the emotional and behavioral Consequence. Therapy works not by changing A (events are often outside our control) but by identifying and revising the irrational beliefs at B that drive distress at C.

Epictetus would have recognized this immediately. It is what he taught for decades in his school at Nicopolis.

The Deeper Foundation: The Dichotomy of Control

The passage from the Enchiridion is the most-cited Stoic text in CBT literature, but it rests on a more fundamental distinction that Epictetus develops throughout his teaching: the dichotomy of control.

The Enchiridion opens with it:

"Of things, some are in our power, and others are not. In our power are opinion, movement towards a thing, desire, aversion; and in a word, whatever are our own acts. Not in our power are the body, reputation, offices, and in a word, whatever are not our own acts."

— Epictetus, Enchiridion, 1, trans. Elizabeth Carter

This is the philosophical architecture underlying Ellis's therapeutic insight. The things that are genuinely in our power — opinion, desire, aversion, judgment — are precisely what therapy can work with. The things that are not in our power — what happened, what other people do, the consequences of events — are precisely what therapy cannot change and what distress most commonly focuses on.

Ellis's intervention is Stoic in structure: identify the belief (the thing in your power), examine whether it is rational, and revise it. The event itself (not in your power) is not the target. The judgment about the event is.

The Parallel in Practice

The practical similarities between REBT and Epictetan Stoicism go deeper than the foundational insight.

Disputing irrational beliefs is the core REBT technique. The therapist helps the client identify beliefs that are absolutist, catastrophizing, or disconnected from evidence, and challenges them directly. Epictetus used a strikingly similar method in his school. The Discourses record him confronting students with their actual beliefs — drawing them out, exposing the hidden assumptions, and pressing until the student could see why the belief did not hold:

"And when you see someone weeping in grief, either because his child has gone abroad or because he has lost his property, take care that the impression does not carry you away as if he were suffering in external things. But have ready at once: 'What afflicts this man is not this occurrence — for another person is not afflicted by it — but his judgment about it.'"

— Epictetus, Enchiridion, 16, trans. Elizabeth Carter

The unconditional acceptance of self — one of the three core REBT principles Ellis developed — has a direct Stoic precursor in Epictetus's teaching that your worth as a rational being is not contingent on external outcomes, social approval, or the evaluation of others. What you are is not what happens to you.

Homework and behavioral practice — a hallmark of CBT structure — mirrors what Epictetus called the three disciplines: the discipline of desire, the discipline of action, and the discipline of assent. Philosophy, in Epictetus's account, is not something you understand in a classroom. It is something you practice daily under the pressure of actual events.

What This Means for the Therapy

The Stoic origin of CBT is not merely of historical interest. Understanding where the framework came from clarifies what it is trying to do and why it works when it works.

CBT's core mechanism — that changing how you think about something changes how you feel about it — is not a finding of clinical psychology. It is a finding of Stoic philosophy, verified by twenty-three centuries of observation. Epictetus was not speculating when he taught that opinions cause disturbance. He had watched people in his school learn to change their judgments and, in doing so, change their lives.

The therapeutic apparatus of CBT — the structured techniques, the homework, the cognitive restructuring forms — is a clinical operationalization of something Epictetus was doing with students every day. What the clinic calls cognitive distortions, Epictetus called false impressions. What CBT calls disputing beliefs, Epictetus called the discipline of assent. What CBT calls unconditional self-acceptance, Epictetus called the recognition that your rational character is the only thing that is genuinely yours.

None of this diminishes CBT. It locates it in a tradition — one that has been refining the same insight for a very long time.

For the Stoic philosophical foundations described in this post, see our guides to Epictetus, the dichotomy of control, the discipline of assent, and the three disciplines of Epictetus.

Sources

• Epictetus. Enchiridion. Trans. Elizabeth Carter. Available via Perseus Digital Library.
• Epictetus. Discourses. Trans. Robin Hard. Oxford University Press, 2014.
• Ellis, Albert. Reason and Emotion in Psychotherapy. Lyle Stuart, 1962.
• Robertson, Donald. How to Think Like a Roman Emperor. St. Martin's Press, 2019.
• Robertson, Donald. The Philosophy of Cognitive-Behavioural Therapy. Karnac Books, 2010.