One verse

Srimad Bhagavatam 1.2.6

1.2.6

स वै पुंसां परो धर्मो यतो भक्तिरधोक्षजे । अहैतुक्यप्रतिहता ययात्मा सुप्रसीदति ॥ ६ ॥

sa vai pumsam paro dharmo yato bhaktir adhoksaje ahaituky apratihata yayatma suprasidati

sah
that
vai
certainly
pumsam
for mankind
parah
sublime
dharmah
occupation
yatah
by which
bhaktih
devotional service
adhoksaje
unto the Transcendence
ahaituki
causeless
apratihata
unbroken
yaya
by which
atma
the self
suprasidati
completely satisfied.

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.