How do you make a decision you cannot undo?

The short answer: **stop looking for the option with no loss in it.** There is not one. An irreversible decision asks which of two future versions of you gets to exist, and the other one does not — so the real question is not *which is better* but **which loss can you carry.**

People stall on these for years waiting for a certainty that only arrives afterwards, and only sometimes.

Reversible and irreversible are different problems

Most advice about decisions is written for reversible ones, where the right move is to choose fast, find out, and correct. That advice is good and it does not apply here.

For the irreversible kind the cost of being wrong is real and permanent, so the correct amount of deliberation is genuinely higher. The error is not that people think about these too long. It is that they think about the wrong thing for a long time — comparing outcomes they cannot know instead of losses they can.

Ask what you are willing to have been wrong about

Not *what is the best outcome*. You do not have access to that and neither does anybody else.

Ask instead: **in ten years, which of these would I rather have been wrong about?** Being wrong about leaving and being wrong about staying are different shapes of regret, and most people, asked honestly, already know which one they could live inside.

That question is answerable. The other one is not, which is why it can be asked forever.

Regret is not symmetrical

Worth knowing, because it changes the arithmetic: people much more often regret the thing they did not do. Not always — a genuinely bad action is regretted sharply — but the long, quiet, decade-shaped regrets are overwhelmingly about the unopened door.

The reason is mechanical rather than romantic. A thing you did has an outcome; it resolves, and you adapt to it. A thing you did not do stays an imagined life, which never disappoints you, never gets ordinary, and never stops being available to compare against.

Say it in your own voice, not somebody else's

Say the decision out loud as a sentence beginning *I am going to*. Not *I think maybe I should*. If the sentence is unsayable, that is information, and it is not fear — fear can say a sentence.

And do not outsource it. Advice from people who love you is mostly a description of what they would find easiest to watch.

Where this is in the book

Chapter one ends at a scene called *The Cost*, which is about a decision with nothing reversible in it and no version where nobody loses. The book is honest about that in a way most stories are not.