Visualising Failure: The Stoic Practice of Premeditatio Malorum

Most fear is vague. "What if the trade goes wrong?" "What if the launch flops?" The Stoics had a practice for turning that fog into something you can deal with: imagine the setback clearly, in advance, and decide how you would respond. It is called premeditatio malorum, and done properly it is a planning tool, not an invitation to dwell on disaster.

What is premeditatio malorum?

Premeditatio malorum is Latin for roughly "the premeditation of evils" or "pre-rehearsal of troubles". It is a Stoic exercise in which you deliberately picture things that could go wrong, such as loss, failure, criticism or illness, so that they do not catch you unprepared and so you can decide in advance how to act well if they happen.

The idea appears clearly in Seneca. In Letter 91 of his Moral Letters to Lucilius, written after a fire destroyed the city of Lyon, he argues that it is the unexpected that weighs on us most, so our minds should be "sent forward in advance to meet all problems", considering not just what usually happens but what can happen. In Letter 24 he advises a worried friend to assume the feared outcome will happen, then measure it honestly, and see how much smaller and more bearable it is than the fear suggested.

Why did the Stoics practise it?

Three Stoic ideas sit behind the exercise:

• Surprise magnifies distress. Seneca's point in Letter 91: an anticipated setback hurts less than a shock.
• Our judgements shape our reactions. Epictetus opens the Enchiridion by separating what is within our power (our opinions, aims and choices) from what is not (body, property, reputation). In section 5 he says people are disturbed not by things but by the views they take of them. Rehearsing a setback gives you time to examine those views before the event, not during it.
• Externals are not guaranteed. The Stoics treated health, wealth and reputation as "indifferents": often worth pursuing, but not the source of a good life, according to the Stanford Encyclopedia of Philosophy's entry on Stoicism. Picturing their loss is a reminder not to stake your peace of mind on them.

How is it different from worrying or negative thinking?

Worry loops. Premeditatio malorum ends. The difference is structure: a defined scenario, an honest estimate, and a decided response. Modern psychology has studied several related strategies, though none is a direct test of the Stoic exercise.

Two findings are relevant. Research on defensive pessimism by Norem and Cantor (Journal of Personality and Social Psychology, 1986) found that some anxious people perform better when they think through possible failures in advance, and worse when that strategy is interfered with. And a 2021 meta-analysis of 21 studies with 15,907 participants found that mental contrasting with implementation intentions, which pairs imagining a goal with naming the obstacle and an if-then plan, improved goal attainment with a small to moderate effect (Wang, Wang and Gai, Frontiers in Psychology, 2021), while noting possible publication bias. A separate review of health behaviours found a similar small to moderate effect (Cross and Sheffield, Health Psychology Review, 2019). These support the general idea that facing obstacles in advance helps more than ignoring them; they do not prove the Stoic version specifically.

How do you practise premeditatio malorum, step by step?

1. Pick one real situation. A specific upcoming event: a hard conversation, a job interview, a trade, a race, a product launch.
2. Name the setback precisely. Not "it goes badly" but "the client says no", "the stop is hit", "I get injured in week six".
3. Estimate it honestly. How likely is it, and how bad would it really be? Seneca's Letter 24 test: assume it happens, then measure it.
4. Sort what is in your control. List what you could do before (preparation, risk limits) and after (your response). Leave the rest.
5. Write the response as an if-then line. "If the stop is hit, I close the platform and log the trade." This turns a fear into a plan.
6. Accept the remainder. Once you have prepared what you can, say plainly that the rest is outside your power, as Epictetus frames it.
7. Stop. Keep it to five or ten minutes. The exercise should end with you lighter, not heavier.

What does it look like in practice?

Trading. Before the session, picture three losing trades in a row. Decide now: maximum daily loss, what you will do when it is reached, and that you will not move a stop to avoid the pain. This is the same discipline we cover in the psychology of the stop-loss and Stoicism in trading.

Training. Picture a niggle that rules out heavy lifting for two weeks. Decide in advance what you will still do (walking, mobility, upper body) so the injury does not become a reason to stop entirely.

Work. Before a pitch, picture the hardest question you could be asked and the flat "no". Prepare the answer to the first and a gracious response to the second.

Marcus Aurelius used a version of this each morning, reminding himself in his Meditations (Book 2, section 1 in most modern editions) that he would meet ungrateful, arrogant and difficult people that day, and resolving in advance not to be harmed or angered by them.

What are the common mistakes?

• Catastrophising. Imagining the worst possible outcome in vivid detail without estimating likelihood or planning a response.
• No time limit. An open-ended session turns into worry.
• Using it to avoid action. The point is to act with less fear, not to talk yourself out of acting.
• Doing it when distressed. If you are already anxious or low, rehearsing losses may make it worse. Anyone dealing with persistent anxiety should speak to a GP or psychologist; a philosophical exercise is not a substitute for care.

How does it connect to other Stoic practices?

Premeditatio malorum is one of a family of Stoic exercises. Its close cousin is memento mori, the reminder of mortality that the Stoics used to sharpen priorities. Both rest on the core Stoic distinction between what is and is not in your power, explained in our beginner's guide to Stoicism. Together they aim at the same thing: steady action that does not depend on everything going your way.