The Letters

Things You'll Actually Miss

By Seçil Sayhan, MSc Clinical Health Psychology & Wellbeing2 min readSeptember 28, 2026

What’s in this article

  1. The pattern
  2. The mechanism behind it
  3. What to do with it
  4. The bigger picture
  5. Frequently asked questions

my grandmother described her best years once and it was all weather and kitchens. no achievements. i remember being disappointed by that answer at twenty and understanding it completely much later.

The pattern

my grandmother described her best years once and it was all weather and kitchens. no achievements. i remember being disappointed by that answer at twenty and understanding it completely much later.

everything worth keeping happens in the parts of the week that don't get scheduled — which means they're also the parts that get cut first when something has to give.

we defend the calendar. the calendar doesn't contain the life.

comment AUDIT and i'll send you the free life audit — it starts with what's actually in your week.

The mechanism behind it

My grandmother described her best years to me once, and it was all weather and kitchens. No achievements. I was quietly disappointed by that answer at twenty and understood it completely a decade later.

An ordinary Tuesday. Someone's laugh from another room. Being needed for something small. The drive where you took the long way. The noise of a full house.

Everything worth keeping happens in the parts of a week that don't get scheduled — which means those are also the first parts cut when something has to give. And something always has to give.

We defend the calendar. The calendar doesn't contain the life.

What to do with it

everything worth keeping happens in the parts of the week that don't get scheduled — which means they're also the parts that get cut first when something has to give.

we defend the calendar. the calendar doesn't contain the life.

comment AUDIT and i'll send you the free life audit — it starts with what's actually in your week.

The bigger picture

everything worth keeping happens in the unscheduled parts of the week — which is also why they're the first thing cut when something has to give.

my grandmother described her best years once. it was all weather and kitchens. no achievements.
Run the numbers on your own week.

The Life Audit is free and comes back written: where your hours actually go, and what handing the repeatable half over would change.

Get the free Life Audit →

Frequently asked questions

What is the main idea of "Things You'll Actually Miss"?

Asked about her best years, my grandmother described weather and kitchens. Six things that live in the unscheduled part of a week — which is also the part that gets cut first.

everything worth keeping happens in the unscheduled parts of the week — which is also why they're the first thing cut when something has to give?

my grandmother described her best years once. it was all weather and kitchens. no achievements.

How do you actually apply this?

Start with the Life Audit at marsa.ai/life-audit — free, and it turns this piece into a concrete first step.

Is this about willpower or systems?

Systems. Willpower is finite and unreliable; the durable lever is changing the system, the environment, and the defaults underneath the behavior.

Who is this for?

Founders, operators, and anyone trying to perform and live well in the AI age — the science applies whether it moves a person, a market, or a machine.

Where can I go deeper?

Start with the free protocols at marsa.ai. Every claim here draws on the clinical literature — see the full bibliography at marsa.ai/research.

About the author

Seçil Sayhan is the founder of MARSA. She spent a decade on one question: what makes a person thrive, instead of just keeping going. Then she built a company of her own and met the same problem from the inside, which is why MARSA has two halves: machines that take the work which repeats, and the training for the person those hours come back to. BA Business Management · MSc Clinical Health Psychology and Wellbeing · Certified in Neuroplasticity and Lifestyle Medicine, Harvard. Every method traces to a public bibliography of 190+ peer-reviewed sources: see the research.