The Eraser Test
Test a painful past by pricing everything its removal would erase
- Difficulty
- Moderate
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 98%
The Eraser Test is Gawdat's named thought experiment. Imagine a technology that can remove a traumatic event from the timeline, not merely erase the memory. First name the event, then decide whether to remove it while recognising that every later relationship, lesson, and capacity caused by that event would disappear too. Gawdat says he presented the test to roughly 12,000 people and reports that almost all chose to keep the event, but the episode provides no study design or independent verification, so that figure remains his account. The useful mechanism is the complete counterfactual: pain cannot be removed while its effects are selectively retained. The exercise should never be used to tell another person that trauma was beneficial or necessary.
Origin
Gawdat says he created the thought experiment for the control chapter of Solve for Happy and later used it with large live audiences.
Core principles
- 01Removing an event would also remove its downstream consequences
- 02A fair counterfactual counts relationships, learning, and resilience as well as pain
- 03Valuing later outcomes does not make the original harm good
- 04Past usefulness can support cautious hope about a current setback
How to run it
- 1
Select the event
Choose a past hardship you are willing and able to examine. State it without requiring yourself to call it good.
Pro tip Begin with a less overwhelming event if the exercise is new.
Watch out Do not use self-guided reflection when it is destabilising or unsafe.
- 2
Imagine full erasure
Remove the actual event from the timeline, not only the painful memory. Accept that the later path must change with it.
Pro tip Resist preserving favourite consequences by assumption.
- 3
Trace the consequences
List people met, choices made, lessons learned, and capacities developed because the event occurred. Include harmful consequences as well as valued ones.
Pro tip Use specific causal links rather than generic claims about growth.
Watch out Do not invent benefits to force a positive conclusion.
- 4
Make the whole choice
Decide whether you would erase the event together with everything attributed to it. Let either answer be legitimate.
Pro tip Write what makes the choice difficult in both directions.
- 5
Borrow cautious perspective
If past setbacks later produced value, allow the possibility that a current difficulty may also matter differently in hindsight. Do not claim that outcome is guaranteed.
Pro tip Use “may” rather than “will.”
Watch out Hope about later meaning must not replace present protection or corrective action.
In the wild
Gawdat asked participants to identify a traumatic event, choose whether to erase it, and account for every friendship, lesson, and source of resilience that would vanish with it. He reports that nearly all declined, though the transcript does not independently validate the result.
→ Participants considered the entire altered timeline rather than pain in isolation.
Common mistakes
Keeping benefits in the erased timeline
The test only works when the event and its attributed consequences are removed together.
Turning a report into proof
Gawdat's 99.99% result is an unsourced personal report in the episode, not established research evidence.
Prescribing meaning to someone else
No one should be pressured to value trauma or told that a harmful event was required for growth.
Is it for you?
Best for
People reflecting voluntarily on a past hardship after enough distance to consider its downstream effects.
Not ideal for
Acute trauma, pressuring someone to find benefits in harm, or excusing preventable abuse, negligence, or injustice.
From the transcript
“The eraser test is a thought experiment.”
“if you erase it, you're going to erase everything that happened as a result”
From the episode
The Happiness Expert That Made 51 Million People Happier: Mo Gawdat