Virtues are the application of reason

Virtues are the application of reason, and as such, it seems worthwhile to pause for a moment and reflect on what reason actually means.
You've probably come across the word a dozen times already in our journey together, and I believe now is the right time to look at it more closely, or perhaps more accurately, to unpack what we truly mean by reason.

I have to be honest with you.
When I first started seriously studying Stoicism, I didn’t immediately understand what reason truly meant. I recognized its importance early on, but I didn’t fully grasp it. At the time, I was focused on aspects of the philosophy that felt much more accessible: the dichotomy of control, the judgments we place on things, and so on.

But over time—gradually—I began to get it.

I began to understand that our philosophy—though it carries a certain mystical tone, especially in its relationship to the Universe, is, at its core, a far more intellectual pursuit than it might seem at first.

Reason is a way of being. A way of interpreting the world, of moving through it. Because activating your rationality, especially in critical moments, like when you're suddenly overwhelmed by emotion, requires an inner effort. It demands that you pause and unfold a clear line of thinking in your mind. That’s why I say it’s an intellectual matter. Because to reason is to set that extraordinary machine in your head into motion, the billions of neurons that have been firing since you were born, to bring forth a clear vision. A lucid, realistic view, stripped of the excesses of the moment.

And why is this so important? Why does it strike at the very heart of Stoic teaching? Because without that kind of vision, you’re at the mercy of everything.
Every thought that passes through your mind.
Every emotion that flares up without warning.
Every opinion that slips into your head without you even noticing.
And so you react.
You get shaken.
You suffer.
And the worst part? You think it’s normal. That’s the real trap, the one we all fall into before we begin to understand. Before that crucial turning point. Socrates had already seen it, long before the Stoics: “Man is ill,” he said. Not sick in the medical sense, but sick with ignorance. He thinks he knows.
He thinks his emotions are valid simply because they’re natural. As if everything that comes from nature must be good. Sure, some emotions have a role to play. Fear can keep you from jumping off a cliff. Love can move you to build a family. But believing that all emotions are inherently useful or right? That’s a mistake, a big one, in our view. Because on the one hand, yes, you need to learn to temper them. To avoid being swept away. But on the other, and this might be even more vital, you need to sort them. To tell apart the ones that protect your life from the ones that poison it. Some emotions are like parasites: they don’t come from your inner wisdom, but from faulty judgments, old wounds, confusion. And as long as you don’t recognize them for what they are, they’ll keep running your life for you.

If your reason is clear and well-guided, it naturally recognizes what is good: courage, justice, temperance, wisdom. And it instinctively rejects what leads it astray, the four irrational passions: fear, desire, distress, and pleasure.

This is the kind of reason that guides us—both in virtue and in passion. You want to be courageous?
Then first, you need to discern, through reason, what is just, what is truly worth your commitment. You want to be temperate? Once again, you must reason: evaluate what is excessive, what is truly good for you, what nourishes your being rather than flatters your ego. You want to be just? It is reason that teaches you to see the other not as an obstacle or a pawn, but as your equal, your brother, a part of the whole. And even wisdom the highest of all virtues in Stoicism is, quite literally, the perfected use of reason.

If I’m taking the time to tell you all this at the start of this section, it’s to bring one essential point back to the forefront of your mind: Reason is the cornerstone of your existence, at least, for the Stoic mindset you’re striving to cultivate. But more than that, reason is also the result of living virtuously.

Virtue—which, in Stoicism, is the one and only true good.

And that brings us to the second essential point: virtue is the only thing that truly matters to the Stoics.
That alone should tell you just how important it is. For us, the only thing in the world that truly counts is to be virtuous. Everything else, even the most beautiful things: glory, love, wealth, success, friendship, happiness; and the most painful ones: abandonment, loss, poverty, loneliness, are merely outcomes of fate, external to us. And so, within that framework, the only thing that holds real value—the only true good, is moral good: virtue.

In Stoic ethics, nothing that happens to you—nothing external—is good or bad in itself. Not the rain on your vacation, not a promotion, not even the love of your life that lasts forever, nor that same love choosing to walk away with your best friend. These are, objectively, just events.
What you make of them, though…That’s a different story entirely.
And that story—it’s your reason that writes it.

If you take this in, if you truly integrate it, you’ve understood Stoicism.
I mean it.
At least, you’ve understood practical Stoicism, applied Stoicism. But since the ancients taught that Stoicism wasn’t something to think about, but something to live, I’d go as far as to say this: if you’ve grasped that the only true good is virtue, then you’ve grasped Stoicism.

Reason is the capacity to choose with awareness. And so, every virtue is the expression of reason rightly exercised. We’ll explore each of them in the four articles that follow.