Audio well said.
The water may be pure originally, but contaminated by the time it reaches the well’s head.
Nevertheless, it has to come through the head for us to hear it.
Some people know what they are talking about, whilst others pretend.
What seems meaningful to me may be of no value to you.
I have collected together some text and audio that has helped me:
On this Google Drive
On this OneDrive
Good audio with transcripts: