The Upanishads, Part 1 (SBE01), by Max Müller, , at sacred-texts.com
1. 'When one perceives, then one understands. One who does not perceive, does not understand. Only he who perceives, understands. This perception, however, we must desire to understand.'
'Sir, I desire to understand it.'
121:1 As Nârada asks no further, whether there is anything better, higher, truer than prâna, he is supposed to be satisfied with his belief that prâna is the Highest Being. Sanatkumâra, however, wishes to lead him on to a still higher view; hence the paragraphs which follow from 16 to 26.
121:2 He would, for instance, call fire real, not knowing that fire is only a mixture of the three elements (cf. VI, 4), the rûpatraya, a mere variety (vikâra), and name (nâman).