UttararāmacaritaAnushtubh
वज्रादपि कठोराणि मृदूनि कुसुमादपि । लोकोत्तराणां चेतांसि को हि विज्ञातुमर्हति ॥
The minds of extraordinary souls are harder than the thunderbolt and softer than a flower. Who can truly know them? (Bhavabhuti, Uttararamacharita)
abyasam.com/en/subhashitam/sub-vajradapi-kathorani-134
wisdomcompassionvirtueknowledge