Certainly that heart is steel-framed which, in spite of one’s chanting the holy name of the Lord with concentration, does not change when ecstasy takes place, tears fill the eyes and the hairs stand on end.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तदश्मसारं हृदयं बतेदं यद्गृह्यमाणैर्हरिनामधेयैः । न विक्रियेताथ यदा विकारो नेत्रे जलं गात्ररुहेषु हर्षः
tadaśmasāraṃ hṛdayaṃ batedaṃ yadgṛhyamāṇairharināmadheyaiḥ | na vikriyetātha yadā vikāro netre jalaṃ gātraruheṣu harṣaḥ
SB 2.3.24