Core ideas · Guide 4 of 12

The four Stoic virtues: wisdom, justice, courage and moderation

The Stoics held that virtue is the only true good, and that it takes four forms. What each virtue means, why the Stoics thought they were really one, and how to practise them.

4 min read · Updated September 2026

Ask what makes a life go well and most people will list health, money, relationships and success. The Stoics gave a startling answer: only one thing is truly good, and that is virtue, meaning excellence of character. Everything else, from wealth to reputation to health, is at best useful material that a good person can use well or a bad person can use badly.¹

Virtue, in turn, takes four main forms: wisdom, justice, courage and moderation. Marcus Aurelius names them together when he describes what a person who truly understood the good would care about:

For if any man should conceive certain things as being really good, such as prudence, temperance, justice, fortitude, he would not after having first conceived these endure to listen to anything which should not be in harmony with what is really good.

(Prudence is an older word for practical wisdom, and fortitude for courage.)

Wisdom: knowing what actually matters

For the Stoics, wisdom is not cleverness or learning. It is knowing what is good, what is bad, and what is neither, and so knowing how to act. Epictetus puts the whole scheme in one sentence:

Now the virtues and everything that shares in them are good, while vices and everything that shares in vice are evil, and what falls in between these, namely, wealth, health, life, death, pleasures, pain, are indifferent."

Seneca calls wisdom the goal and philosophy the road to it:

Wisdom is the perfect good of the human mind; philosophy is the love of wisdom, and the endeavour to attain it.

In practice, wisdom is the virtue that keeps the others honest. Without it, courage becomes recklessness and justice becomes self-righteousness.

Justice: acting for the common good

Justice for the Stoics was broader than law. It meant treating others fairly and acting for the good of the community, in the belief that people are made for one another. Marcus returns to this constantly, never more briefly than here:

That which is not good for the swarm, neither is it good for the bee.

Musonius Rufus, Epictetus’s teacher, makes the same point about ordinary duties: a person should act not only for themselves but for their neighbours and their city.

Tell me, then, is it fitting for each man to act for himself alone or to act in the interest of his neighbor also, not only that there may be homes in the city but also that the city may not be deserted and that the common good may best be served?

Courage: facing what is hard

Courage covers more than bravery in battle. It is the willingness to face pain, danger, loss, embarrassment or death when doing the right thing requires it. Seneca is careful to separate it from mere daring:

For bravery is not thoughtless rashness, or love of danger, or the courting of fear-inspiring objects; it is the knowledge which enables us to distinguish between that which is evil and that which is not.

Notice the definition: courage is a kind of knowledge. The brave person is not someone without fear but someone who has understood that most of what we fear is not truly bad.

Moderation: mastering desire

Moderation, also called temperance or self-control, is the right relationship with pleasure and desire: enjoying what is good in its place, without being ruled by appetite. Musonius makes a striking argument that it is actually the more pleasant way to live:

If one were to measure what is agreeable by the standard of pleasure, nothing would be pleasanter than self-control; and if one were to measure what is to be avoided by pain, nothing would be more painful than lack of self-control.

Temperance controls our desires; some it hates and routs, others it regulates and restores to a healthy measure, nor does it ever approach our desires for their own sake.

Four names for one thing

Here the Stoics made an unusual claim: the virtues cannot be separated. Whoever truly has one has them all, because each is the same underlying wisdom applied to a different area of life.¹ You cannot be genuinely just while being a coward, or genuinely brave while lacking self-control; sooner or later the missing virtue undermines the others.

Four names for one thing: the same wisdom, applied to four areas of life.

Seneca describes the four names as a kind of division of labour for one character:

The desires had to be reined in, fear to be suppressed, proper actions to be arranged, debts to be paid; we therefore included self-restraint, bravery, prudence, and justice—assigning to each quality its special function.

This is why Stoic ethics can sound demanding. The goal is not to be good at one thing but to become a certain kind of person throughout.

Why only virtue is good

The strongest claim is that virtue is not just the best good but the only one. Seneca states it plainly:

It follows that the things which are often scorned by the men who are moved with a sudden passion, and are always scorned by the wise, are neither goods nor evils. Virtue itself is therefore the only good; she marches proudly between the two extremes of fortune, with great scorn for both.

The reasoning is that anything which can be used badly, like money, health or intelligence, cannot be good in itself; only the character that uses these things well is. The Stoics did not say wealth and health were worthless. They called them preferred indifferents: reasonable to choose, but not necessary for a good life.¹

How to practise the virtues

A useful Stoic habit is to run a situation past each virtue in turn:

Wisdom: What here is actually good or bad, and what only seems so?
Justice: What do I owe the other people involved? What would be fair to them?
Courage: What am I avoiding because it is uncomfortable, rather than because it is wrong?
Moderation: Where am I being pulled by appetite, comfort or ego rather than judgment?

The evening review is a natural place to ask these questions. For more on the idea that character, not circumstance, determines a good life, see eudaimonia and tranquillity.