bijam mam sarva-bhutanam
viddhi partha sanatanam
buddhir buddhimatam asmi
tejas tejasvinam aham
Meaning: O son of Prtha, know that I am the original seed of all existences, the intelligence of intelligent, and the prowess of all powerful men.
*** He is the prime eternal among all eternals. He is the supreme living entity of all living entities, and He alone is maintaining all life. One cannot do anything without intelligence, and Krsna also says that He is the root of all intelligence. Unless a person is intelligent, he cannot understand the Supreme Personality of Godhead, Krsna.