tad aśma-sāraṁ hṛdayaṁ batedaṁ
tad aśma-sāraṁ hṛdayaṁ batedaṁ
yad gṛhyamāṇair hari-nāma-dheyaiḥ |
na vikriyetātha yadā vikāro
netre jalaṁ gātra-ruheṣu harṣaḥ ||
(Śrīmad Bhāgavatam: 2.3.24)
“That heart which cannot become transformed [i.e., melted] by Hari’s names being chanted, oh! That is iron! When transformation [i.e., melting of the heart] occurs, [however,] water in the eyes and horripilation in the pores appear.”