The Preaching of the Insentient

The adepts of old spoke of staying up all night listening to the preaching of the insentient. What did they mean? How and what can rocks and rain teach?
They can. In fact the insentient is both direct and eloquent.
But to hear the insentient requires that you listen very closely.
Then:
All night long the rocks and rain speak in a language that has no sound.
To a person who has no ears.
They say, “I am you”.