Premeditatio Malorum: Rehearsing the Bad Day on Paper

2026-09-07 · Yesterself

There is an old Stoic habit of sitting down before the day starts and imagining what could go wrong in it. The Latin name is premeditatio malorum — the premeditation of evils, or more plainly, thinking ahead about bad things. Seneca returns to it often in his letters to Lucilius. His argument is that misfortune lands hardest on the person who never considered it possible, and that a mind rehearsed on loss meets loss as something already familiar rather than something outrageous.

As an idea it is easy to nod at. As a practice it is easy to ruin. Done badly, premeditatio malorum is just worrying with a nicer name on it, and you can spend twenty minutes every morning making yourself worse. Done well, it is short, specific, and oddly steadying — closer to a pilot walking through an engine-out checklist than to lying awake at three in the morning.

The difference is almost entirely structural. What follows is the page, the two failure modes to watch for, and the test that tells you which one you are in.

The three-column page

Take a page. Draw two lines down it so you have three columns. Head them: the likely obstacle, the worst realistic version, the line I would want to say.

Write two or three rows. Not ten. The exercise scales badly.

Column one: the likely obstacle

Not the worst thing that could happen today. The thing that probably will. Look at your actual calendar and your actual inbox and write down the friction you can already see coming.

The 2 p.m. review. Priya will ask why the migration slipped and I will not have a clean answer.

That is the right altitude. Vague dread does not belong in this column — "work will be stressful" gives you nothing to prepare for. If you cannot name the hour and the person, you are not looking at an obstacle, you are looking at a mood.

Column two: the worst realistic version

Here is where the exercise usually slides off the road. The word doing the work is realistic. You are asking: if this goes badly, what does badly actually look like?

She says the estimate was never credible and asks me to hand the timeline to someone else. It happens in front of four people. I feel about two inches tall for the rest of the afternoon.

That is a bad afternoon. It is not a catastrophe, and writing it down lets you see that it is not a catastrophe. Compare it with what an anxious mind produces unattended: fired, unemployable, ruined. The second column is not a place to indulge that but a place to draw a ceiling over it.

A useful constraint: the worst realistic version is one you could describe to a level-headed friend without them saying "come on." If it fails that test, write the version that would pass.

Column three: the line I would want to say

This column is what makes the page a preparation rather than a rehearsal of despair. Write the actual sentence you would want ready — words, in quotation marks, the way you would say them out loud.

"The estimate was mine and it was wrong. Here is what I know now and here is the date I would defend."

Much of the fear in column two is not fear of the event. It is fear of being caught without anything to say — the silence, the hot face. Writing one plain sentence in advance takes some of that away. You may never use the line. It does its work by existing.

If the bad thing is not the kind you can answer with words — a diagnosis in the family, a plan that simply ends — then column three becomes the smallest next action instead. Who you would call. What you would cancel. Where you would sit down.

The two ways this goes wrong

Failure one: the spiral

The exercise gives worry permission to speak, and worry will take more than it was offered. You start with the 2 p.m. review and forty minutes later you are somewhere near your own funeral, having written nothing in column three.

The structural defenses are dull and effective. Cap the rows at three. Set a timer for ten minutes and stop when it goes. Finish each row before starting the next; three obstacles and three worst cases with no lines is just a list of things to be afraid of. And do this in the morning, at a desk, with the day in front of you. Not in bed. Not at night.

If you notice you have circled the same fear for three days without column three changing, the page has stopped being preparation. Close it and do something with your hands. If that is the shape of most of your mornings, it belongs with a professional rather than a better page.

Failure two: the theatrical catastrophe

The opposite failure looks more philosophical and teaches even less. You rehearse the plane crash, the sudden bankruptcy, the house fire. These feel serious. They are also so unlikely and so unspecific that no preparation follows from them. You cannot write a useful third column for a meteor.

Seneca was not being theatrical, whatever the reputation suggests. His examples are exile, poverty, illness, the death of people he loved — the ordinary contents of a Roman life. The exercise is aimed at the probable and the survivable, because those are the things you will actually meet.

A plain filter: if it happened, would anything you wrote this morning change what you did next? If not, it does not belong on the page.

The Stoic test that separates the two

The old distinction is between what is up to us and what is not. Epictetus builds nearly everything on it: our judgments, our intentions and our responses are ours; outcomes, other people's reactions and the past are not.

So, one question to run over each row before you close the book. Does this row end in something I control?

Column three is the checkpoint. If your line is "I hope she takes it well," the row ends outside you and it is worry. If your line is "I say the estimate was mine," the row ends inside you and it is preparation. Rows that end in someone else's verdict cannot be finished, which is exactly why the mind keeps returning to them at night.

Run that test and the page usually shrinks. Two of your three obstacles turn out to be one obstacle in different clothes, and the third turns out to be a decision you have been avoiding.

What to do with the page afterward

Most of these pages are worth nothing by evening. That is fine — the value was in the eight minutes.

But a few are worth revisiting, because premeditatio malorum has an unadvertised second half: you find out what actually happened. Reading a morning's column two beside the plain record of how the day went is its own correction. Sometimes the rehearsed version never arrived. Sometimes it arrived smaller, or in a shape you had not thought to write down. You only learn which by checking, and the checking works only if you can find the old page — an argument for dating everything and keeping your journal somewhere you can go back through. It is also why replying to your own past entries is a more interesting practice than it sounds.

Yesterself is built around that return: each morning it brings back one letter drawn from your own past writing, and what you write in the evening becomes tomorrow's mail. It is not released yet; the only thing to join is the waiting list. But you do not need an app for any of this. Three columns, a timer, and the question of what is actually up to you will do the work.

None of this is medical advice, and journaling is not treatment. It does not diagnose, manage or replace care for anxiety or any other condition. If rehearsing bad outcomes reliably makes your days worse, or if anxiety is a persistent feature of your life, take that to a doctor or a licensed therapist.

Common questions

What does premeditatio malorum mean?

It is Latin for the premeditation of evils, a Stoic exercise of deliberately thinking through what could go wrong before a day or an undertaking. Seneca discusses it repeatedly in his letters to Lucilius, arguing that hardship strikes hardest at people who never considered it possible.

How is this different from ordinary worrying?

Worry loops on outcomes you do not control and never finishes. This exercise is bounded in time, limited to a few likely obstacles, and each row ends in something you would say or do, which is why it can be closed.

How long should the practice take?

About eight to ten minutes, with two or three rows at most. If it regularly runs longer than that, it has usually stopped being preparation and started being rumination.

Should I imagine death and disaster the way the Stoics did?

Seneca's examples were the ordinary risks of his own life, not spectacular ones. A good test is whether anything you write would change what you actually did next; if not, the scenario is too remote to teach you anything.

Can this help with anxiety?

This is a writing practice and not medical advice, and it is not a treatment for anxiety or any other condition. If the exercise consistently leaves you worse off, stop and speak with a doctor or a licensed therapist.