Which is fine so far as it goes: it surely is true that if we could manage never to fret about things we can’t affect, then life would proceed serenely. But it strikes as a major weakness of Stoicism – at least in its rediscovered, newly fashionable form – to assume that seeing the truth in an insight like this can bring peace of mind by itself. Among the many things we can’t control, it turns out, are our own emotions.

What Sigmund Freud and his successors brought to psychology was the understanding that conscious thought might be only a tiny sliver of what’s going on in the mind as a whole. So if a global pandemic triggers our particular anxieties around death, or illness, or job security – anxieties formed over decades, and embedded in our unconscious – it’s radically insufficient to try to think ourselves into realising they’re futile. If pointlessness caused things to vanish, Pop Sockets that people stick on the backs of their phones wouldn’t exist. Yet they do.

That is why the dichotomy of control is best approached as a preliminary tool. We (can) use it to distinguish what we can control from what we can’t – but peace of mind arrives only when we begin taking action in the realm of the former, the can-do.

As the saying goes, we can’t think ourselves into new ways of acting, but we can act ourselves into new ways of thinking.

It’s often less a matter of realising how little control we have than how much. We can’t stop the worldwide spread of a disease, but we can do plenty to stop it spreading through us. We can’t choose physical fitness, but we can choose to eat well, and to move. We can’t choose to make it through today’s to-do list, but we can choose to spend the next three hours diligently attacking it. And so on.

There’s a deep kind of freedom to be found here, even in the presence of severe external constraints. Our goals shift from external ones, about imposing certain changes on the world, to internal ones, about how we plan to act upon the world. These are objectives we can aim at wholeheartedly, fully expecting to accomplish – secure in the knowledge that they don’t require the cooperation of forces whose assistance we’re in no position to compel.