It is Tuesday, 8pm. The children are bathed and fed. There is a glass of sauvignon blanc on the counter and your husband is already on the sofa. All you want is to sit down, switch on the television and forget the entire conversation with Don.

He pushed every button you have. You ended up red faced, furious and incoherent, and you beat yourself up the whole drive home. Now the memory sits in your mind like a tumour, and every time your thoughts drift near it, it hurts. You know what you are supposed to do. You are supposed to sit with it, do the reflection, accept the anger and the frustration and move to the question of what next. You are not going to do that. You are going to numb it.

I know, because I have done exactly this. More Tuesdays than I would like to admit, the sauvignon blanc won.

Here is the part the motivational posts leave out: tonight, that is fine. The conversation with Don set off your threat detection system hours ago and it has been running ever since. Asking yourself to sit calmly with the most painful moment of your day, right now, while your body is still braced for danger, is like asking yourself to examine a burn by pressing on it. No amount of inspiration wins that contest, and pretending otherwise just gives you one more thing to feel you failed at. Have the wine. Watch the television.

The real question is not what happens on Tuesday night. It is what happens on Wednesday.

What actually keeps you in the work

Because there are two Wednesdays available to you. In one, the Don conversation stays a tumour. You avoid it, it throbs quietly for a week or two, and the reflection joins the long list of good intentions. This is how it usually goes, by the way. Not a moment of dramatic quitting, just a slow slide down the to-do list until it quietly falls off the end.

In the other Wednesday, you come back to it. Not because you are more disciplined than the first version of you, but because you can remember why this matters to you. Something larger than the discomfort of the exercise is pulling you back to it.

This is the honest case for knowing your purpose. Simon Sinek built a career on start with why, and Angela Duckworth’s research on grit points at something similar: people persevere at hard things when those things are connected to something they care about beyond themselves. But I want to be precise about the mechanism, because this is where the genre usually overclaims. Purpose does not make the hard moment easier. It does not switch off your threat detection system or make Don less infuriating. What it does is give the reflection a reason that outlasts the discomfort, so that coming back to it is not a chore you owe yourself but evidence gathering in service of something you actually want.

And here is what I have watched happen, in my own practice and in my clients’, when Wednesday follows Tuesday often enough. The reflection becomes a habit, and the habit gets integrated into your patterns. The conversation that used to be an infuriating trigger starts to be met with something closer to here we go again. And then it moves. What began as something you did the day after starts happening the same evening, and eventually in the room itself, while Don is still mid-sentence. Examined, the tumour shrinks; unexamined, it grows. The sauvignon blanc can always come after. It just stops being anaesthetic and becomes what it was meant to be, a glass of wine at the end of the day.

You already have the data

So how do you find this purpose? Not, I promise, with an ikigai diagram. I thoroughly enjoyed García and Miralles’ book on ikigai, and I recommend it, but I will be honest with you: it never made it into my behaviour.

If you are a scientist, you already know how this works: observation before hypothesis. You do not invent a purpose. You examine the evidence for the one you already have, because it has been leaking out of you for years, every time you did a hard thing anyway.

Try this now, before reading on.

Think of three moments in your career when you did something genuinely difficult and did not back down. The conversation you dreaded but had. The decision that made you unpopular. The project you carried when you were running on empty. For each one, write down what was going through your mind at the moment you pushed through. Not what you told yourself afterwards. What was actually there, in the moment.

When I ask clients this, something consistent emerges. The answer is almost never abstract. One client, a senior leader with two children, found the same faces in every moment: her daughter and her son, watching how she handled it. Another kept finding a younger version of herself, the one nobody had helped, whom she was determined her own people would never have to become. When I did this exercise on my own history, I found patients, children, other women scientists, at different times the business itself. Always someone. Always outside myself.

That is your raw data. Specific, person-shaped, and probably protective. For most of my clients it comes as a surprise, because it does not look like what they thought a purpose was supposed to look like.

Making it bigger than a moment

The observations alone are not quite enough, though. I ran on mine for years without being able to articulate what connected them, and the cost of that was subtle: each hard thing had to find its own justification, one Tuesday at a time. I see the same cost in a client I am working with now. She has a very clear motivational pull; she can feel it in every hard moment, and it has carried her through plenty of them. But a pull is not yet a purpose, and right now it is not helping her choose between the directions competing for her time. Until the pull is put into words, it cannot rank anything. What changed it for me was a journaling practice built around one question, and it is the question I now put to clients once they have gathered their evidence:

If you succeeded in the change you are trying to make, and everyone around you were doing the same, what would be different in the world?

Sit with that one properly. Write past the first answer, which is usually too small. My clients start with something like I just want my team to be okay, and that is true, but it is the local case of something larger. Keep asking what it would mean if it scaled. Somewhere in the writing, the specific moments join up into a general statement, and the thing you have been protecting one person at a time turns out to be a claim about how work, or science, or leadership ought to be. It stops being small.

That statement is your purpose. Not a poster on the wall, but a working hypothesis, supported by your own behavioural data, that predicts when you will find the strength to do hard things and explains why they are worth doing.

Journal prompts

Take these in order, over a few sittings rather than one.

1. Recall a recent conversation or event that still hurts to think about. Without going into the event itself yet, write down what made it feel worth having in the first place. What were you standing for when you walked into that room?
2. List the three moments from the exercise above, the times you did the hard thing anyway. For each, name who or what you were protecting.
3. Look across all three. What repeats? Write the pattern as plainly as you can, even if it feels obvious or unimpressive.
4. Now scale it. If the change you keep fighting for happened everywhere, not just on your team or in your department, what would be different in the world? Write past your first answer.
5. Finally, return to the conversation from prompt one. Read what you have written in prompts two to four, then ask: what does this conversation look like as evidence in service of that? What is the next experiment?

And if tonight is a Tuesday and the wine is already poured, none of this is going anywhere. It will still be here on Wednesday. That is rather the point.