So said Seth Godin in a segment of a Q&A session.
Articulating culture is really hard, my go-to definition to date has always been ‘The way we do it around here‘ from Michael Porter.
This articulation ‘People like us do things like this‘ adds to it, by widening the circle to which it applies.
If there is not a shared set of beliefs and behavioral norms that describe how and why you do the things you do, in any organisation or institution, chances are the outcomes will be suboptimal.
I recommend you watch this, (it is only 7 minutes) and while the answer is to a question from a politician on how to win, it has far wider implications for us all.
Then think about the behaviour you want, and the means by which you can measure progress towards it to build a sustaining culture.