sdi

I found the reference I was thinking of. It's from "Saved by the Light," chapter 2:

I began to look around. Below us were other Beings who looked like me. They appeared to be lost and shimmered at a rate far slower than the rate at which I shimmered. As I watched them I noticed that I slowed down as well. There was a discomfort in this reduced vibration that made me look away.

I looked above me. There were more Beings, these brighter and more radiant than I. I felt discomfort when looking at them as well because I began to vibrate faster. It was as though I had drunk too much coffee and was now speeding up and moving too fast. I looked away from them and straight ahead [...]