Narada-bhakti-sutra Text 6
Translation & Purport by His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
TRANSLATION
One who understands perfectly the process of devotional service in love of Godhead becomes intoxicated in its discharge. Sometimes he becomes stunned in ecstasy and thus enjoys his whole self, being engaged in the service of the Supreme Self.
PURPORT
The Śrīmad-Bhāgavatam (1.7.10) states,
ātmārāmāś ca munayo nirgranthā apy urukrame
kurvanty ahaitukīṁ bhaktiṁ itthaṁ-bhūta-guṇo hariḥ
“Although those who are ātmārāma, self-satisfied, are liberated from all material contamination, they are still attracted by the pastimes of the Supreme Lord, and thus they engage themselves in His transcendental service.” When Lord Caitanya explained this ātmārāma verse to Śrīla Sanātana Gosvāmī, He described sixty-one meanings, and all of them point toward the devotional service of the Lord.
How one becomes intoxicated in devotional service is very nicely described in the Śrīmad-Bhāgavatam (11.2.40):