The Supreme Personality of Godhead is known as Vasudeva because He lives everywhere. The word vas means to live. As stated in Brahma-samhita, eko py asau racayitum jagad-anda-kotim: [Bs. 5.35] the Lord, through His plenary portion, enters into each and every universe to create the material manifestation. He also enters into each and every heart in all living entities and into each and every atom also (paramanu-cayantara-stham). Because the Supreme Lord lives everywhere, He is known as Vasudeva. Although He lives everywhere within the material world, He is not contaminated by the modes of nature. The Lord is therefore described in Isopanisad as apapa-viddham. He is never contaminated by the modes of material nature. When the Lord descends on this planet, He acts in many ways. He kills demons and performs acts not sanctioned by the Vedic principles, that is, acts considered sinful. Even though He acts in such a way, He is never contaminated by His action. He is therefore described herein as suddha, meaning always free from contamination. The Lord is also sama, equal to everyone. In this regard, He states in Bhagavad-gita (9.29), samoham sarva-bhutesu na me dvesyo sti na priyah: the Lord has no one as His friend or enemy, and He is equal to everyone.