No separation between ourselves and others

From Tricycle.com:

There is a term in the Celtic tradition that I find resonates with something fundamental about Zen practice. The Celts spoke of “thin places,” places like caves or wells or other special sites where the boundary between the mundane and magical was permeable. To me, Zen practice offers a kind of thin place, a “place” where we can discover that there is fundamentally no separation between ourselves and others, that what we seek is always so close, always right here.

Roshi Pat Enkyo O'Hara