From the Kena Upanishad

By whom?

A student asks his teacher what moves the mind, the breath and the senses. The answer points to something none of them can reach. Then the teacher tells a story about the gods, a blade of grass and a wonder none of them could name. This is the Kena Upanishad, told simply.

The studentwho wants to know what moves the mind
The teachera forest teacher the Upanishad does not name
? By whom?