I will read to you from one of the Upanishads. It is called the Katha Upanishad.[Source] The Vedanta philosophy, as it is generally called at the present day, really comprises all the various sects that now exist in India. Thus there have been various interpretations, and to my mind they have been progressive, beginning with the dualistic or Dvaita and ending with the non-dualistic or Advaita.[Source]
Sacrifice of Vajasravas
ॐ उशन् ह वै वाजश्रवसः सर्ववेदसं ददौ ।
तस्य ह नचिकेता नाम पुत्र आस ॥ १॥
oṃ uśan ha vai vājaśravasaḥ sarvavedasaṃ dadau .
tasya ha naciketā nāma putra āsa .. 1..
Vajasravasa, desiring rewards, performed the Visvajit sacrifice, in which he gave away all his property. He had a son named Nachiketa.
Swami Vivekananda Says —
This the Katha Upanishad speaks in very figurative language. There was, in ancient times, a very rich man, who made a certain sacrifice which required that he should give away everything that he had…He had a boy called Nachiketas.[Source]