Bhagavad Geeta Chapter 9 - The Royal Secret
Verse 13, 14
13. But the Mahatmas (great souls) O Partha! partaking of my divine nature, worship me with a single mind (with a mind devoted to nothing else), knowing me as the imperishable source of all beings.
14. Always glorifying me, striving, firm in vows, prostrating before me, and always steadfast, they worship me with devotion.
15. Others also, offering the 'wisdom sacrifice' worship me in various ways, regarding me as the one, as the distinct, as the manifold me, who in all forms, face up everywhere.