Seneca would have understood the inbox. Writing in the first century, the Roman statesman, playwright and philosopher observed that people who would never let a stranger take their money hand over their time to anyone who asks for it. They guard their property with vigilance, he noted in On the Shortness of Life, but are wildly generous with the one resource of which it would be honourable to be miserly. Replace petitioners at the door with notifications on a screen, and the diagnosis barely needs editing.

His central claim in that essay is counterintuitive. Life, Seneca argued, is not short. It is long enough for great achievements if it is well invested. We make it short by squandering it, scattering ourselves across obligations we did not choose and pleasures we do not enjoy. The busy, in his portrait, are always preparing to live and never quite living. They postpone the good life to a future that may never arrive, and meanwhile the present leaks away through a thousand small openings.

The first of his letters to his younger friend Lucilius opens on exactly this note. Seneca urges him to claim himself for himself, and to gather and guard the time that until now has been taken from him, stolen from him or simply allowed to slip away. It is an unusually practical start to a philosophical correspondence. There is no metaphysics yet, no theory of the cosmos. Just a friend telling another friend that he is being robbed, and that the thief is mostly habit.

Everywhere and nowhere

In the second letter, Seneca turns to reading, and his advice lands with uncanny precision on the modern habit of skimming. He warns Lucilius against wandering restlessly among too many authors, sampling everything and digesting nothing. A person who is everywhere, he observes, is nowhere. Food that is brought up as soon as it is eaten does no good. The image is deliberately crude. So is the experience of closing forty browser tabs and realising that nothing you read in them has stayed.

It is worth admitting that Seneca was hardly a model of simplicity. He was one of the richest men in Rome and an adviser to Nero, and critics in his own time mocked the gap between his teachings and his fortune. But that tension makes him more useful, not less. He writes as someone who knew the pull of power, money and distraction from the inside. His letters are less a sermon from a hermit than notes from a man trying, and often failing, to live well amid pressure.

Nadia Farrokh, a psychotherapist in Leeds who runs small Stoic reading groups, says her members rarely come for the philosophy. They come because they are exhausted. What they discover, she says, is permission to treat their attention as something that belongs to them. Borrowing the later Stoic Epictetus and his distinction between what is up to us and what is not, her groups sort the week's demands into two columns, and then decide, deliberately, which messages can wait until tomorrow.

People arrive thinking Stoicism will make them feel less. It actually asks them to notice more, and to be honest about what is theirs to carry.

The Stoics offer no app and no system. What they offer is a question to ask before each small surrender of time: is this mine to give, and is this where I would choose to give it? Asked sincerely, it is surprisingly hard to answer yes to most of the pings that fill a day. Seneca did not expect perfection from Lucilius, or from himself. He expected attention, practised daily, and a life that was lived rather than merely scheduled.