Know Me, O Partha, as the eternal seed of all beings. I am the intellect of the intelligent, and the radiance of the radiant.
Explanation
Krishna continues telling Arjuna how he is present as the essence within the world, here as the lasting source (bīja) of all living things. He is also the intellect (buddhi) in those who are wise and the brilliance (tejas) in those who shine. Traditions differ on emphasis: non-dualist readings see this as Brahman being the underlying reality of all things, while devotional readings stress Krishna as the personal source of all qualities.