Caitanya-caritāmṛta 7.73
vajrād api kaṭhorāṇi mṛdūni kusumād api lokottarāṇāṁ cetāṁsi ko nu vijñātum īśvaraḥ
[vajraad api kathoraani mridooni kusumaad api lokottaraanaam chetaamsi ko nu vijnaatum eeshvarah]
Blended reading (Sanskrit + English inline)
vajrād api kaṭhorāṇi mṛdūni kusumād api lokottarāṇāṁ cetāṁsi ko nu vijñātum īśvaraḥ
“The hearts of those above common behavior are sometimes harder than a thunderbolt and sometimes softer than a flower. How can one accommodate such contradictions in great personalities?”
My note
Source: vedabase.io