Ref: Kena 9 / 1.01
What the breath cant breathe, and by which breath is drawn, that alone is Brahman, not what people adore.
Ref: Kena 10 / 2.00
The Teacher, "If you think you know it well, then you know but little. You may know what is the Brahman-s form.
Ref: Kena 11 / 2.00
The Pupil, "I do not think I know it well, nor do I think, I do not know. He, amongst us, who knows this, he knows it, nor does he know that he does not know it.