This seems like typical mind fallacy. Especially since the quote comes from a writer, who is used to having lots of worlds in his head and may be especially prone to making unwarranted assumptions that his mind is thus typical.
I interpret his statement as contradicting the typical mind fallacy. He invites us to consider that others' conceptions of the world might be "unimaginable" to us.
Quotes are a unique enough medium of expression that I'm interested in viewing quotes that people have found collectable, emotionally impactful, useful, memorable, or otherwise noteworthy - perhaps others are similarly interested. To clarify, these need not be even remotely related to rationality. I'm hijacking the mandates traditionally used for the Rationality Quotes thread, with a few modifications:
Please post any meta discussion in the top-level comment named "Meta".