He who knows this, when he has departed this world, after reaching and comprehending the Self which consists of food, the Self which consists of breath, the Self which consists of mind, the Self which consists of understanding, the Self which consists of bliss, enters and takes possession of these worlds, and having as much food as he likes, and assuming as many forms as he likes, he sits down singing this Saman (of Brahman): 'Havu, havu, havu!

In plain words: Whoever knows this, after death, passes through all the layers of the self—body made of food, breath, mind, understanding and bliss. Then he is free to move through the worlds, take any form and have whatever he wants, and he sings a song of joy: 'Havu, havu, havu!'