I knew I was going to stay on LessWrong when I read the conceptually & rhetorically brilliant:

Ignorance exists in the map, not in the territory. If I am ignorant about a phenomenon, that is a fact about my own state of mind, not a fact about the phenomenon itself. A phenomenon can seem mysterious to some particular person. There are no phenomena which are mysterious of themselves. To worship a phenomenon because it seems so wonderfully mysterious, is to worship your own ignorance.

Which could be perhaps reduced to something like:

Your thoughts are your map; reality is the territory. Watch your step.

and

Mystery is always in the mind, never in the matter.

I don't think these are all that great but I would love a snappy way to express this central insight.