In former time, Yajnavalkya did that good to king Janaka which comes from a study of the Upanishads. The Eternal and Immutable Supreme was the subject which the great Rishi had described to the king of Mithila. It enabled him to attain to that Brahma which is auspicious and immortal, and which is above all sorts of sorrows.
यदुपनिषदमुपाकरोत् तथासौ जनकनृपस्य पुरा हि याज्ञवल्क्यः। च्छुभममृतत्वमशोकमर्च्छति॥