Here are presented together BUBV on BU ch.3 and ch.4. 1-2 which form the core of the philosophical thought of Yajnavalka. They relate to the disputes of the sage with a number of seers. In ch.3, the sage affirms the oneness of the individual self (Jiva) and the Brahman. This is, according to him, vijnanam anandam brahma. Then, in ch.4. 1-2, the sage begins to ascertain the truth (tattva) in his proposition, examining the nature of the experiences of an individual self in the states of walking, dream and deep sleep.

BUBV 3.5 and 4.2 are, however of particular importance since they deal with the views of Bhartrprapanca on matters under discussion.