Caitanya-caritāmṛta 5.41
nirvikāra deha-mana — kāṣṭha-pāṣāṇa-sama! āścarya, — taruṇī-sparśe nirvikāra mana
[nirvikaara deha-mana — kaashtha-paashaana-sama! aashcharya, — tarunee-sparshe nirvikaara mana]
Blended reading (Sanskrit + English inline)
nirvikāra deha-mana — kāṣṭha-pāṣāṇa-sama! āścarya, — taruṇī-sparśe nirvikāra mana
“His mind is as steady as wood or stone. Indeed, it is wonderful that even when he touches such young girls, his mind never changes.
My note
Source: vedabase.io