Stoicism is sometimes misunderstood as a philosophy of suppressing emotion, tolerating misery or remaining expressionless in the face of adversity. In everyday language, calling someone “stoic” often means that they endure difficulty without complaint. Ancient Stoicism, however, was a much richer and more psychologically sophisticated philosophy. It was concerned with how people could live wisely, respond constructively to hardship and avoid creating unnecessary emotional suffering through rigid or mistaken judgements.

More than two thousand years after its beginnings, Stoicism would exert an important influence on psychologist Albert Ellis. In the 1950s, Ellis developed Rational Emotive Behaviour Therapy, or REBT—widely regarded as the first modern form of cognitive behaviour therapy. The connection was not accidental. Ellis openly credited the Stoic philosophers, particularly Epictetus, with expressing one of REBT’s central principles: events contribute to our emotions, but our beliefs and judgements about those events are often what transform difficulty into psychological disturbance.

The Origins of Stoicism

Stoicism began in Athens around 300 BCE. Its founder, Zeno of Citium, came from the island of Cyprus and reportedly arrived in Athens after being shipwrecked. There, he encountered the teachings of Socrates and the Cynic philosophers, whose emphasis on virtue, self-discipline and independence from material possessions strongly influenced him.

Zeno began teaching in a public colonnade called the Stoa Poikile, or “Painted Porch”. His followers became known as the Stoics because of the place in which they met rather than because of any particular personality trait.

The early Stoics developed a comprehensive philosophical system encompassing logic, ethics and the natural world. They believed that the universe was governed by an intelligible order, sometimes called logos, and that human beings lived best when they acted in accordance with reason and nature.

For the Stoics, the highest good was virtue. Wisdom, courage, justice and moderation were considered genuinely good because they reflected the quality of a person’s character. Wealth, health, reputation, comfort and even longevity might reasonably be preferred, but they could not guarantee a good life. They were partly dependent on circumstances and could be used either wisely or foolishly.

This distinction remains one of Stoicism’s most challenging ideas. The Stoics did not argue that health, relationships or security were worthless. Rather, they argued that making happiness entirely dependent upon such things placed our emotional wellbeing in the hands of fortune.

The Early Stoic Thinkers

Zeno established the school, but much of early Stoicism was systematised by Chrysippus, who lived during the third century BCE. Chrysippus was an extraordinarily productive writer and helped develop Stoic theories of logic, knowledge, emotion and human action. Although most of his works have been lost, later writers regarded his contribution as indispensable to the survival of the school.

Cleanthes, Zeno’s successor, was another important early Stoic. He emphasised perseverance, self-discipline and humanity’s place within the larger natural order. His surviving Hymn to Zeus presents the universe as rationally organised and suggests that wisdom involves bringing our own purposes into harmony with it.

During the following centuries, Stoicism spread from Greece into the Roman world. Philosophers such as Panaetius and Posidonius adapted Stoic ideas to Roman political and social life. The philosophy became attractive to statesmen, soldiers, teachers and administrators because it addressed practical questions: How should a person behave under pressure? What is genuinely under our control? How can we act ethically when circumstances are unfair?

Most complete Stoic texts available today come from the later Roman period. The best-known surviving authors are Seneca, Epictetus and Marcus Aurelius.

Seneca: Philosophy in the Midst of Political Danger

Seneca was a Roman statesman, dramatist and philosopher who lived from approximately 4 BCE to 65 CE. He served as an adviser to the emperor Nero and experienced both considerable wealth and serious political danger. His life was not always consistent with the austerity commonly associated with Stoicism, but this tension makes his writings particularly human.

In his essays and letters, Seneca examined anger, grief, anxiety, mortality, friendship and the destructive pursuit of status. He repeatedly observed that people suffer not only from present problems, but also from anticipation, imagination and the demand that life unfold according to their wishes.

Seneca did not advise people to become passive. He encouraged preparation, thoughtful action and full participation in life. His warning was against becoming psychologically enslaved to outcomes that could never be completely controlled. We can make plans and pursue goals, but we cannot compel other people, fortune or the natural world to cooperate.

Epictetus: Judgement, Choice and Control

Epictetus was born into slavery in the first century CE and later became a respected teacher of philosophy. He wrote no books himself. His student Arrian recorded his teachings in the Discourses and condensed many of them into the Enchiridion, or Handbook.

Epictetus’s most influential principle concerns the distinction between what is and is not within our control. Our choices, attitudes, values and deliberate actions are substantially ours. Other people’s opinions, past events, illness, social status and many external outcomes are not entirely ours to command.

This does not mean that external events are unimportant or that people should accept mistreatment without action. It means that effective action begins by recognising reality. If we demand control where we have none, we add helpless rage, panic or despair to an already difficult situation.

Epictetus also made the observation that would later become central to REBT: “People are disturbed not by things, but by the views they take of them.” The statement should not be interpreted to mean that adversity never matters. Bereavement, violence, rejection, illness and injustice have real effects. The point is that people can respond very differently to similar events because they interpret those events differently.

One person might think, “This is painful and unfair, but I can endure it and decide what to do next.” Another might conclude, “This absolutely must not be happening. I cannot bear it, and its occurrence proves that my life is ruined.” The event may be the same, but the resulting emotional and behavioural responses can be profoundly different.

Marcus Aurelius: Stoicism Practised Under Pressure

Marcus Aurelius was Roman emperor from 161 to 180 CE. During his reign, he faced war, political instability, personal loss and a devastating epidemic. His Meditations were private reflections rather than a book written for publication. They reveal a man repeatedly reminding himself to practise the principles he already understood.

Marcus focused on directing attention towards the present, accepting the limits of control, treating others justly and performing one’s responsibilities without excessive concern for recognition. He did not present himself as a perfectly serene sage. Instead, the Meditations show philosophy being used as a form of daily psychological training.

This practical quality helps explain Stoicism’s continuing appeal. It was never intended to be admired merely as an intellectual system. Stoic philosophy involved repeated exercises: examining impressions, questioning judgements, contemplating adversity, observing emotional reactions and deliberately choosing behaviour consistent with one’s values.

Stoicism and Emotion

The Stoics are often accused of wanting to eliminate emotion. More accurately, they distinguished between destructive passions based on extreme or mistaken judgements and appropriate emotional responses grounded in wisdom.

A Stoic could experience concern, affection, sadness, caution and disappointment. What the philosophy challenged was the transformation of these responses into overwhelming disturbance through beliefs such as “This must not happen”, “I cannot tolerate this” or “Because I failed, I am worthless.”

The goal was not emotional numbness. It was freedom from emotional tyranny.

This distinction closely resembles the REBT differentiation between healthy and unhealthy negative emotions. Concern can motivate preparation, whereas debilitating anxiety promotes avoidance. Sadness acknowledges loss, whereas depression may be intensified by hopeless and globally negative conclusions. Regret can encourage corrective action, whereas guilt may involve condemning the whole self for a particular mistake.

Albert Ellis and the Development of REBT

By the middle of the twentieth century, psychoanalysis remained a dominant force in psychotherapy. Treatment frequently involved examining unconscious conflicts, childhood experiences and the presumed symbolic meaning of symptoms.

Albert Ellis initially trained and worked in psychoanalytic approaches. He became dissatisfied, however, with what he regarded as their inefficiency and limited capacity to produce lasting change. He noticed that gaining insight into the historical origin of a problem did not necessarily stop people from continuing to think and behave in self-defeating ways.

During the 1950s, Ellis developed what he first called Rational Therapy, later Rational Emotive Therapy and eventually Rational Emotive Behaviour Therapy. REBT preceded Aaron Beck’s Cognitive Therapy and is therefore commonly described as the first modern cognitive-behavioural therapy, although the broader CBT tradition developed through several related lines of research and clinical practice.

Ellis drew from psychology, behaviourism and a variety of philosophical traditions. Nevertheless, he repeatedly acknowledged his debt to Stoicism. The link is most obvious in the REBT ABC model.

In this model, A refers to an activating event, such as criticism, failure or rejection. C refers to the emotional and behavioural consequences, such as anxiety, depression, anger, withdrawal or aggression. People commonly assume that A directly causes C.

REBT places B, the person’s beliefs, between the event and the consequence. A person may respond to criticism by believing, “I would prefer approval, but I do not need it. Criticism is uncomfortable, not unbearable, and it does not define my worth.” Another person may believe, “I must be approved of. I cannot stand being criticised, and this proves I am inadequate.”

The second set of beliefs is likely to produce more severe and persistent disturbance.

Ellis identified several recurring irrational belief processes: rigid demands, awfulising, low frustration tolerance and global evaluations of human worth. In more ordinary language, people disturb themselves by insisting that reality must conform to their wishes, describing difficulties as totally catastrophic, convincing themselves that discomfort is unbearable and condemning themselves or others as entirely bad.

REBT helps people identify these beliefs, question them and replace them with more flexible and useful alternatives. Importantly, the aim is not unrealistic positive thinking. A rational belief may still acknowledge that an event is painful, unjust or undesirable. What it rejects is the conclusion that the event is literally unbearable, that it should be impossible or that it determines a person’s total value.

Acceptance, Action and Human Worth

Stoicism and REBT also share an emphasis on acceptance, although neither recommends resignation. Acceptance means acknowledging what exists without adding the demand that it must not exist. From that position, a person is better able to decide whether to change the situation, tolerate it or leave it.

REBT developed this principle through unconditional self-acceptance, unconditional other-acceptance and unconditional life-acceptance. People can judge their behaviour without assigning themselves a total human rating. They can disapprove of another person’s actions without concluding that the person is completely worthless. They can recognise life as difficult and unfair without declaring that it is entirely bad.

There are also differences between REBT and ancient Stoicism. REBT is a psychological therapy rather than a complete philosophy of nature, politics and ethics. It does not require belief in a divinely ordered universe, nor does it suggest that external circumstances are irrelevant. Its propositions are intended to be examined pragmatically, logically and empirically.

REBT also gives behaviour an essential role. People do not achieve lasting change merely by discussing rational ideas. They practise approaching feared situations, tolerating discomfort, acting against avoidance and repeatedly strengthening a more flexible philosophy. In this sense, psychological improvement resembles physical training. Insight matters, but change requires practice.

An Ancient Philosophy with a Modern Clinical Legacy

Stoicism has survived because it addresses a permanent human problem: we want the world to be predictable, fair and responsive to our wishes, but it frequently is not. The Stoics argued that peace of mind and effective action depend upon distinguishing preference from demand, influence from control and misfortune from total catastrophe.

Albert Ellis translated much of this insight into a structured psychological therapy. REBT preserved the Stoic view that beliefs are active ingredients in emotional disturbance while adding clinical assessment, behavioural methods and a systematic process for disputing rigid thinking.

The result was an important turning point in psychotherapy. Instead of treating people as passive victims of events or prisoners of their past, REBT proposed that they could learn to examine the philosophies through which they interpreted life. We cannot control every loss, setback, injustice or uncertainty. We can, however, develop greater freedom in how we understand these experiences and how we choose to respond.

That is the enduring bridge between Stoicism and cognitive behaviour therapy: events matter, but our judgements about events also matter—and those judgements can be examined, challenged and changed.