Ref: Kena 3 / 1.00
The eye does not go astray, nor the speech, nor the mind. What we know not, what we cannot understand, how can anyone teach it?
Ref: Kena 4 / 1.00
It is different from the known, it is above the unknown. This we have heard from our forebears, who taught us.
Ref: Kena 5 / 1.00
What is not expressed by speech, and by which speech is expressed, that alone is Brahman, not what people adore.