Since the individual soul is part and parcel of the Supreme Lord, in that sense the Lord is living in every body, and, as Supersoul, the Lord is also present as a witness. In both cases the presence of God in every living entity is essential. Therefore persons who profess to belong to some religious sect but who do not feel the presence of the Supreme Personality of Godhead in every living entity, and everywhere else, are in the mode of ignorance.
-Shrimad Bhagvatam Canto 3 Chapter 29 Verse 22, Translation and Purport

एतावानेव लोकेऽस्मिन् पुंसां धर्म: पर: स्मृत: ।
भक्तियोगो भगवति तन्नामग्रहणादिभि: ॥ २२ ॥
Devotional service, beginning with the chanting of the holy name of the Lord, is the ultimate religious principle for the living entity in human society.
-Shrimad Bhagvatam Canto 6 Chapter 3 Verse 22