Daylight

Practice · What Matters

Ten minutes on the thing you care about most

Values affirmation is one of the shortest exercises psychologists have studied, and it's usually done just once. Here's what it is, what the research measured, and why Daylight brings it back once a month.

Path Integral · 26 September 2026 · 5 min read

  • CadenceOnce a month
  • SessionAbout 10 minutes
  • Based onCreswell et al. (2005)

The practice

Choose the value that matters most to you right now. It might be honesty, family, curiosity, craft, faith, fairness or something else. For about ten minutes, write about why it matters to you, and about a time it showed in something you did.

What Daylight puts on the page

Pick one value that matters most to you — honesty, family, curiosity, whatever it is. For about ten minutes, write about why it matters, and about a time it showed.

The value:

Why it matters to me:

A time it showed:

Where it comes from

The idea comes from self-affirmation theory, which Claude Steele proposed in the 1980s. It says that people protect their overall sense of being a good, capable person. When one part of that sense is threatened, reminding yourself of something else that matters can make the threat feel less total.

In 2005, David Creswell and colleagues tested this under stress. Participants either wrote about their most important value or, in the control condition, about a value that mattered little to them. Then they took the Trier Social Stress Test, a standard laboratory stressor that involves giving a speech and doing mental arithmetic in front of evaluators. Those who had affirmed their most important value showed a smaller rise in cortisol, a hormone involved in the stress response, than the control group.

When it works, and when it doesn't

In 2014, Geoffrey Cohen and David Sherman reviewed more than a decade of affirmation research for the Annual Review of Psychology. They found that the effects depend a great deal on timing and context. Affirmations tended to matter most when done shortly before, or during, a period of real pressure, and in situations where people felt judged or under threat. Where there was little pressure, they tended to make little difference.

That suggests a practical way to use it. If your calendar shows a hard week coming, such as an interview, an exam or a difficult conversation, the day before might be a good time for this practice.

Why monthly

Most of the studies used a single session. Daylight asks once a month so that the practice comes round often enough to be there when you need it, without becoming a routine you write on autopilot. This cadence is our choice, not a schedule that researchers tested, and we'd rather say so. You can also open the practice at any time, for example before one of those hard days.

A note on the evidence. The 2005 study was a laboratory experiment measuring a hormone response, and later reviews describe affirmation effects as real but dependent on context. Daylight gives you the method, tells you where it came from, and doesn't promise what it will do for you.

Sources

  • Creswell, J. D., Welch, W. T., Taylor, S. E., Sherman, D. K., Gruenewald, T. L., & Mann, T. (2005). Affirmation of personal values buffers neuroendocrine and psychological stress responses. Psychological Science, 16(11), 846–851.
  • Cohen, G. L., & Sherman, D. K. (2014). The psychology of change: Self-affirmation and social psychological intervention. Annual Review of Psychology, 65, 333–371.
  • Steele, C. M. (1988). The psychology of self-affirmation: Sustaining the integrity of the self. Advances in Experimental Social Psychology, 21, 261–302.