Sarva-bhuta-sthitam yo mam
bhajaty ekatvam asthitah
sa yogi mayi vartate
Meaning: Such a yogi, who engages in the worshipful service of the Supersoul, knowing that I and the Supersoul are one, remains always in Me in all circumstances.
Bhagavad Gita: Worshipful service of the Supersoul (Text 31, Chapter 6)