PURPORT

Krsna is described by Arjuna in Bhagavad-gita (10.12) as follows: param brahma param dhama pavitram paramam bhavan. "You are the Supreme Brahman, the supreme abode and purifier." Herein this is confirmed. Visnum yad brahma param avyayam. The Supreme Visnu is Krsna. Krsna is the cause of Visnu, not vice versa. Similarly, Brahman is not the cause of Krsna; Krsna is the cause of Brahman. Therefore Krsna is the Parabrahman (yad brahma param avyayam).