And this part of the Upanishads always gives me great joy when I read it:
There is a spirit which is mind and life, light and truth and vast spaces. It contains all works and desires and all smells and tastes. It enfolds the entire universe and in silence is loving to all. This is the spirit that is in my heart, smaller than a grain of rice or a grain of mustard-seed. This is the spirit that is in my heart, greater than the earth, greater than thee sky, greater than heaven itself. This is the spirit that is in my heart; this is brahman.The reason it is so significant for me comes from an experience in an experiment suggested to me when I first began worshipping with Quakers. I was drawn to the non-hierarchical organisation and to many of the beautiful things I had read about them.* The experiment involved a search for "that of God" within me, sitting in silence and looking at my thoughts as they came up. I had to examine each thought to see if it was mine, to see if I had originated it. For much of the time, I was aware of many thoughts and of the fact that as time passed it took longer to discover that the thoughts had originated with me. I was aware too that I was in a very deep, and very still, meditation where there were few thoughts. And then I became aware of something that overwhelmed me from within and it most definitely hadn't started with me or my thinking. The feelings I had were part fear and part bliss, most confusing. And afterwards all I could tell myself was that I had become aware of a infinitesimally small part of me that was filled with this infinitely large "knowledge" that didn't seem to have past or future but knew everything about both. There was a part of me that was a mind of infinite possibility and it was beyond my control. And the section I have quoted comes closest to describing what I found.
*One, from Paul Eddington, interviewed when he knew he would soon die from cancer, was a reply to a question about what he would like his obituary to be: he hoped people would say "He didn't do much harm."