Bhagavatapurana 2.3.24

2.3.24

tadaśmasāraṃ hṛdayaṃ batedaṃ yadgṛhyamāṇairharināmadheyaiḥ /
na vikriyetātha yadā vikāro netre jalaṃ gātraruheṣu harṣaḥ //

24. Verily the hardest granite (steel) is that heart which on the utterance of Hari's names, is not moved (filled) with feelings (of devotion); or which, though influenced, does not manifest the change in tears brimming in the eyes and in the hair standing on end (or when the change in the heart is not borne out by tears in the eyes and the hair standing on end.)