'An ocean is that one seer, without any duality; this is the Brahma-world, O King.' Thus did Yagnavalkya teach him. This is his highest goal, this is his highest Success, this is his highest world, this is his highest bliss. All other creatures live on a small portion of that bliss.

In plain words: Yajnavalkya tells King Janaka that the one true Seer is like an ocean, with nothing separate from it. This is the world of Brahman, the highest reality. It is a person's highest goal, success and joy, and all other beings live on just a small share of that joy.