Wisdom is not communicable according to Hesse's Siddartha. Perhaps that's simply because we humans have no means for sharing interior experiences. We can be in the same place at the same time and in that sense share exteriorly, but the effect these exterior experiences have on us and the thoughts that arise in us are not shared.
We do have language, which is a powerful tool through which we can evoke in each other some sense of the interior experience. The value of language should not be minimized. When well used, it can be powerful indeed (though, in truth, language is seldom used very well).
However, the proximate cause for this line of thought is specifically an experience of language. Part of John 3 was read in church this morning, and my experience of those words was shaped by my own language about that passage from last year. It occurred to me that the language that I've preached is a significant part of my experience which is not shared.
Who is going to share that experience? It is true that others besides myself have heard the words, but not over and other again as I have. A few, I suppose, may have read the text on the web, but they do not feel the words echoing in my body as they read. And none of the ancillary thoughts that passed through my mind as I wrote the message and discovered the meaning went through other people's minds this morning.
Even on the day that I preach a sermon, I know that other people don't hear what I heard as I spoke. I know this because some of them have told me what they heard. It is often interesting, what they do hear, and sometimes relevant to the topic I preach about.
When the passage is read again a year later, I think that I am very much alone in the gathering. I wonder what experience other people nearby may be having as the passage is read. But I cannot know.