Stoicism and Other Traditions

No philosophy is best studied in isolation, and Stoicism least of all. It was born among rival schools in the marketplaces of the ancient world, defined itself in argument with them, and has since found unexpected kin across cultures and centuries. To set it beside other traditions is not to dilute it but to see it more clearly, for comparison reveals both what is distinctive about the Stoic position and how often very different vocabularies are circling the same human questions. This article places Stoicism in conversation with its ancient rivals and with several later traditions, drawing out the genuine affinities and marking the real differences. The gatherings of the New Zealand Stoic Society welcome all of these voices.

Stoicism shared its world with several other schools, and its closest relationship was with the Cynics, from whom it partly descended. Zeno, the founder, studied under the Cynic philosopher Crates, and Stoicism took from Cynicism its stern emphasis on virtue, its self-sufficiency, and its indifference to wealth and status. But it softened and systematised the Cynic stance, building a full philosophy of nature and logic where the Cynics had cultivated a deliberately provocative simplicity, and re-entering the social and political life from which the Cynics had largely opted out. Stoicism is, in one sense, Cynicism brought in from the street and given a household.

Its great rival was Epicureanism. The two schools agreed that philosophy should secure a tranquil life, but disagreed about where the good is found. The Epicureans located it in pleasure rightly understood, the absence of bodily pain and of mental disturbance, and counselled withdrawal from public life to a quiet circle of friends. The Stoics located the good in virtue alone, held pleasure to be merely an indifferent, and insisted on engagement with civic life as a duty. Their physics differed just as sharply: where the Epicureans saw a universe of atoms swerving by chance, with gods who take no interest in us, the Stoics saw a single providential order pervaded by reason. The two schools defined themselves against each other for centuries, and reading them together remains one of philosophy’s most fruitful debates. A third movement, the Sceptics, pressed both by questioning whether we can claim knowledge at all, attacking in particular the Stoic confidence that some impressions are self-evidently true, and recommending a suspension of judgement as its own road to tranquillity.

Among the major schools, the followers of Aristotle, the Peripatetics, stood closest to the Stoics in ethics, which makes their disagreements especially instructive. Both held that the goal of life is flourishing, both made virtue central to it, and both understood the good life as an activity expressing our distinctive nature as rational beings. The differences lie in the details, and they are real.

The sharpest concerns external goods. Aristotle held that a flourishing life requires not only virtue but a reasonable measure of health, friends, resources and good fortune, that a genuinely good person broken by catastrophe is not fully flourishing. The Stoics rejected this, insisting that virtue alone suffices for happiness and that everything else is at most a preferred indifferent. This is the great divide between the two ethical traditions, and it remains a live question: is the Stoic right that we can secure a good life against all fortune, or the Aristotelian right that some external goods are simply necessary? They differed, too, about emotion. Where the Aristotelian ideal was the moderation of the passions, feeling the right amount at the right time, the Stoic ideal was their transformation, the replacement of the disturbing passions with the good feelings of a well-ordered mind.

Stoicism owed much to Plato as well, and the relationship deepened over time. The Stoic conception of a rational order governing the cosmos, and of the human soul’s kinship with that order, has Platonic roots, and the later Stoic Posidonius drew the two traditions closer by granting the soul non-rational elements in a way Plato would have recognised. Yet on metaphysics the schools parted decisively. Plato held that the truest realities are immaterial Forms, eternal patterns beyond the physical world. The Stoics were materialists of a striking kind, holding that only bodies exist and act, and that even the soul and the divine reason are, in their way, corporeal. The Platonist looks beyond the physical world for the real; the Stoic finds reason immanent within it.

Among traditions that arose entirely independently, none offers more striking parallels with Stoicism than Buddhism, and the comparison is as illuminating for its differences as for its likenesses. Both traditions trace much of human suffering to the mind’s own workings rather than to external events: where the Stoics locate our disturbance in mistaken value judgements, Buddhism points to craving and attachment as the roots of dissatisfaction. Both cultivate a disciplined attention to the present moment, the Stoic prosoche finding a counterpart in Buddhist mindfulness. Both confront impermanence directly, the Stoic meditation on flux and mortality echoing the Buddhist contemplation of the transience of all things. And both prize a hard-won equanimity in the face of fortune.

The metaphysical frameworks, however, diverge profoundly, and it is a mistake to collapse the two. Buddhism teaches the absence of a permanent self and orients practice toward liberation from the cycle of rebirth, goals with no real Stoic equivalent. The Stoic, by contrast, affirms a rational cosmic order, retains a robust notion of the self as a rational agent, and directs the philosophy back toward engaged citizenship in the human world rather than toward release from it. The likenesses are genuine and worth dwelling on, but they are likenesses of practical wisdom arrived at by very different roads, not a shared doctrine.

Stoicism and early Christianity grew up in the same Mediterranean world, and the two are historically entangled. Stoic vocabulary and ideas left a mark on early Christian thought, from the language of the divine reason, the logos, to a shared emphasis on providence, on acceptance of what befalls us, and on the brotherhood of all people. The apostle Paul, addressing an Athenian audience, is reported to have quoted a line of Stoic poetry, and a forged correspondence between Seneca and Paul circulated in later antiquity, evidence of how naturally the two were associated in the ancient mind. Epictetus and Marcus Aurelius were read with admiration by many later Christians.

The traditions remain distinct in their foundations. The Stoic divine is an impersonal reason immanent in nature, not a personal God who loves and redeems; the Stoic path is one of self-sufficiency through reason rather than salvation through grace; and the Stoic hope is for a life made good now, in agreement with nature, rather than for a life to come. The kinship is real and the borrowings genuine, but Stoic acceptance of providence and Christian trust in God, however similar in tone, rest on different ground.

Among modern philosophies, existentialism is in some ways Stoicism’s nearest relative, and in others its sharpest contrast. The existentialists were preoccupied with human freedom, with the weight of responsibility for our own choices, and with living honestly in the face of mortality, all themes a Stoic would recognise. The psychiatrist Viktor Frankl, writing from the concentration camps, argued that even when everything else is stripped away a person retains the freedom to choose their attitude, a claim that stands very close to Epictetus’s insistence that our judgements remain our own under any circumstance.

The decisive difference lies in their pictures of the universe. The Stoics believed the cosmos to be rationally ordered and providential, so that to live according to nature is to fall in with a meaningful whole. Much of existentialism begins from the opposite premise, that the universe is silent and indifferent, offering no given meaning, so that meaning must be created by the individual in the teeth of an absurd world. Both traditions place enormous weight on the stance we take toward our lives, and both refuse to let circumstance excuse us from that responsibility. But the Stoic takes their stand within an order they trust, while the existentialist takes theirs in the absence of any such assurance. The contrast throws the Stoic faith in a rational cosmos into especially clear relief.

None of this comparison dilutes Stoicism. On the contrary, each contrast sharpens it: against Epicurus we see why the Stoics staked everything on virtue; against Aristotle, why they refused to let fortune hold any power over happiness; against the existentialists, how much rests on their trust in a rational order. To know a philosophy well is in part to know what it is not, and the surrounding traditions are the light by which its outline becomes visible.

This is why the New Zealand Stoic Society reads Stoicism in company rather than in a sealed room. We place it within the long human effort to understand how to live, an effort that no single school has completed. You are welcome at our gatherings whatever tradition you arrive with, or none. What we share is not a finished set of answers but a common question, how to live well, and the good company in which to pursue it.