The Person is all this, sacrifice, penance, Brahman, the highest immortal; he who knows this hidden in the cave (of the heart), he, O friend, scatters the knot of ignorance here on earth.

In plain words: The divine Person is all of this: worship, discipline, and Brahman, the highest reality that never dies. Whoever finds him hidden in their own heart is freed, even in this life, from the tangle of not knowing the truth.