I must be stupid," I said. "I don't doubt that his talk is full of profound hidden truths, but I find it terribly hard to understand." Dikaiarchos la… - L. Sprague de Camp

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I must be stupid," I said. "I don't doubt that his talk is full of profound hidden truths, but I find it terribly hard to understand."
Dikaiarchos laughed. "I'll tell you a secret, Chares. I cannot understand it, either."
"You, sir?"
"Yes. It may be that we are both stupid, or it may be that there is nothing to understand. It is a good practical rule that, if a man cannot explain himself in terms that any reasonably intelligent listener can comprehend, he doesn't know what he is talking about himself.