evaṁ-vrataḥ sva-priya-nāma-kīrtyā
jātānurāgo druta-citta uccaiḥ
hasaty atho roditi rauti gāyaty
unmāda-van nṛtyati loka-bāhyaḥ
evam-vrataḥ - when one thus engages in a vow to chant and dance; sva - own; priya - very dear; nāma - the holy name; kīrtyā - by chanting; jāta - in this way develops; anurāgaḥ - attachment; druta-cittaḥ - very eagerly; uccaiḥ - loudly; hasati - laughs; atho - also; roditi - cries; rauti - becomes agitated; gāyati - chants; unmāda-vat - like a madman; nṛtyati - dances; loka-bāhyaḥ - not caring for outsiders.
This verse is quoted from Śrīmad-Bhāgavatam (11.2.40).