The Upanishads, Part 1 (SBE01)
Chapters
Khandogya-Upanishad: Second Prapathaka: Seventh Khanda

SEVENTH KHANDA.

1. Let a man meditate on the fivefold Saman, which is greater than great, as the pranas (senses). The hinkara is smell (nose), the prastava speech (tongue), the udgitha sight (eye), the pratihara hearing (ear), the nidhana mind. These are one greater than the other.

2. What is greater than great belongs to him, nay, he conquers the worlds which are greater than

great, who knowing this meditates on the fivefold Saman, which is greater than great, as the pranas (senses).

Footnotes

^25:1 Prana is explained by ghrana, smell; possibly ghrana may have been the original reading. Anyhow, it cannot be the mukhya prana here, because it is distinctly represented as the lowest sense.