Caitanya-caritāmṛta 6.214
tarka-śāstre jaḍa āmi, yaiche lauha-piṇḍa āmā dravāile tumi, pratāpa pracaṇḍa’
[tarka-shaastre jada aami, yaiche lauha-pinda aamaa dravaaile tumi, prataapa prachanda’]
Blended reading (Sanskrit + English inline)
tarka-śāstre jaḍa āmi, yaiche lauha-piṇḍa āmā dravāile tumi, pratāpa pracaṇḍa’
“I had become dull-headed due to reading too many books on logic. Consequently I had become like an iron bar. Nonetheless, You have melted me, and therefore Your influence is very great.”
My note
Source: vedabase.io