In plain words
Natism is respect for where we come from: our birth, lineage, place and specific culture. Those roots give the psychological safety that makes taking risks possible.
Source: Essential Foundations — Natism and Nitism. Get the PDF
An everyday example
Cooking a grandparent's recipe with a neighbour who grew up elsewhere: you carry your story forward, and it becomes a way to meet someone rather than a wall.
A question to sit with
Whose story do you carry forward this week?