Marcus Aurelius said that pain either affects the body or the soul. Only one of them do you have any say over. The soul can choose not to be affected, preserving its own serenity, its own tranquillity. All our decisions, urges, desires, aversions lie within. No evil can touch them. Pierre Hadot called this the inner citadel, an inner fortress that fate, chaos, hysterics, vice, and outside influences could never penetrate or break down.
There is something quietly reassuring in that image. Not a wall built in panic, but a space tended from within. The Stoics were not teaching us to be cold. They teach us how to replace unhealthy emotions with healthy ones. They called these eupatheiai. Joy or delight (chara) is the enjoyment of perceiving goodness in ourselves and others. It includes cheerfulness (euphrosunos) and peaceful contentment (euthumia). Caution (eulabeia) is a healthy aversion to vice, like conscience. Wishing (boulêsis) is goodwill, benevolence (eunoia), kindness (eumeneia), acceptance (aspasmos) and affection (agapêsis).
Marcus says the wise mans delight comes from acting consistently in accord with wisdom and virtue. There is a steadiness in that. Contemplating virtue in ourselves is the primary source of serenity and joy. Yet he also gladdens his heart by reflecting on the good qualities of those close to him. When he wants to strengthen himself, he looks at modesty, generosity, and the character of others. Joy moves outward and then returns, like breath.
And then there is the image of the spring. Suppose that men kill you, cut you in pieces, curse you. What then can these things do to prevent your mind from remaining pure, wise, sober, just? If a man stands by a clear pure spring and curses it, the spring never ceases sending up potable water. Cast clay or filth into it and it will speedily disperse them and wash them out. A mind content with itself, depending upon nothing beyond the good it may find within its own convictions, will be pushed this way and that. Yet it can remain fully itself.
Ada Palmer speaks of self-monitoring, keeping an inner lookout. She asks: can I find an actionable solution? If not, can I let go? Can I laugh? Will this matter in a year or five years? Sometimes reframing is enough to clear the water. Like a guest at a banquet, we stretch out our hand and take a portion with decency. If it passes by, we do not detain it. We are grateful, but not over attached. The spring keeps flowing. The citadel stands. And tranquillity, when it comes, feels less like victory and more like returning home.