The fourth brahmanam continues to build the thematic description of Atman-Brahman (Self, Soul) and the state of self-realization as achieved. Yajnavalkya declares that Knowledge is Self, Knowledge is freedom, Knowledge powers inner peace. In hymn 4.4.22, the Upanishad states, "He is that great unborn Self, who consists of Knowledge, is surrounded by the Prânas (life-force), the ether within the heart. In it there reposes the ruler of all, the lord of all, the king of all. He does not become greater by good works, nor smaller by evil works. He is the lord of all, the king of all things, the protector of all things. He is a bank and a boundary, so that these worlds may not be confounded. He who knows him [soul, becomes a Muni. Wishing for that world, mendicants leave their homes."