Unverified personal Gnosis (UPG) is spiritual insights and knowledge developed by means that can’t be objectively checked.
A distinct, uncorroborated understanding about a deity or other entity that is acquired through personal interaction. This is different from having a “theory” or a “headcanon.” It is based on personal experiences rather than mere speculation.
Gnosis means knowledge or an understanding. It is most often used regarding spiritual or esoteric knowledge.
UPG can be problematic when presented as fact rather than personal understanding, particularly when authors do this. However, it definitely has its place.
Excerpt from Circle of Frith by Rev Maire Durkan of the Troth
Chapter 1: Unverified Personal Gnosis (aka UPG) p. 1 & 2.
All of the stories that we have were once unverified personal gnosis that became substantiated personal gnosis through the shared experience of many people and over time, Of course, times change, and our practice must adapt, grow, and change as well, but the lore provides a basis for our beliefs. I have a healthy respect for unverified personal gnosis; in fact, I prefer to call it just personal gnosis…
I believe that our ancestors, like the little võlva (seeress) in Erik the Red’s Saga, learned about the gods and goddesses through UPG much as we do today.