I don't know if any of this would be applicable, but I'm thinking about the nature of light. One, light projected out into the universe will continue onward (unless it impacts something); so, with the right observational capacity, long after we are gone, one could theoretically go to a specific distance from us and look back to us and still see us alive in our lived past; i.e. the light we see here on earth left the sun 8 minutes before we actually see it. Maybe that could be applied to whatever jms is thinking in that quote. Two, anything moving at the speed of light does not experience time; Einstein's Relativity shows us that time slows down the closer to the speed of light an object gets, so something like light itself moving at the speed of light exists in a state of singular, constant instance, unaffected by time. So, applying this to jms's quote, maybe he's making some statement about an indestructible constant state of the soul. More likely, he's probably thinking of something completely unrelated to anything I said here.