Kena Upanishad 2.p1

2.p1

dvitīya khaṇḍa

Prāṇena, by the organ of smell, produced from earth, existing in the nostrils, and associated with the activities of the internal organ and the vital force; yat, that which; man na prāṇiti does not smell, does not comprehend like smell; yena, that by which light of the Self; prāṇaḥ, the organ of smell—being illumined as an object; praṇīyate, is impelled—towards its own object. All the rest, tat eva etc., is just like what has gone before.

Fearing that the disciple, to whom has been brought home the conviction, "You are the Self, which is opposed to the acceptable and the unacceptable, and which is Brahman", may jump to the conclusion, "I know myself well enough that I, indeed, am Brahman", the teacher, with a view to dispelling that notion of the disciple, says, "If you think" etc.