[bambax]

> pg may have meant at that particular moment

That's plausible; however, the conscious brain is constantly thinking / wandering / conjecturing about the past and the future, so it's next to impossible to not have a train of thought while you're awake. (If you have years and years of training as a zen master, maybe; if not, not).

Therefore, saying that people don't have a train of thought at a specific point in time is a little like saying they don't have a brain.

The rest of the post from PG would tend to confirm this: "ordinary people can understand" (...) "what they don't grasp".