Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 35

Sanskrit:

यदा ग्रहग्रस्त इव क्‍वचिद्धस-त्याक्रन्दते ध्यायति वन्दते जनम् ।मुहु: श्वसन्वक्ति हरे जगत्पतेनारायणेत्यात्ममतिर्गतत्रप: ॥ ३५ ॥

ITRANS:

yadā graha-grasta iva kvacid dhasatyākrandate dhyāyati vandate janammuhuḥ śvasan vakti hare jagat-patenārāyaṇety ātma-matir gata-trapaḥ

Translation:

When a devotee becomes like a person haunted by a ghost, he laughs and very loudly chants about the qualities of the Lord. Sometimes he sits to perform meditation, and he offers respects to every living entity, considering him a devotee of the Lord. Constantly breathing very heavily, he becomes careless of social etiquette and loudly chants like a madman, “Hare Kṛṣṇa, Hare Kṛṣṇa! O my Lord, O master of the universe!”

Purport:

When one chants the holy name of the Lord in ecstasy, not caring for outward social conventions, it is to be understood that he is ātma-mati. In other words, his consciousness is turned toward the Supreme Personality of Godhead.