Principles before policies?

There are some great ideas here already, but I think it's important that we decide what shape we want our new Cymru to be. What are the driving beliefs and principles? We have a good start with the Future Well-Being goals (they should be legally binding on WG though!) Once we know those principles, many of the detailed policies will tend to follow naturally from them. So do we need to start with a draft section for our constitution-to-be "We hold these truths to be self-evident..." sort of thing