The Supreme Occupation

sa vai pumsām paro dharmo
yato bhaktir adhoksaje
ahaituky apratihatā
yayātmā suprasīdati

The supreme occupation [dharma] for all humanity is that by which men can attain to loving devotional service unto the transcendent Lord. Such devotional service must be unmotivated and uninterrupted to completely satisfy the self.

SB 1.2.6

vāsudeve bhagavati
bhakti-yogah prayojitah
janayaty āśu vairāgyam
jñānam ca yad ahaitukam

By rendering devotional service unto the Personality of Godhead, Śrī Krsna, one immediately acquires causeless knowledge and detachment from the world.

SB 1.2.7