Caitanya-caritāmṛta 1.139
abhivyaktā mattaḥ prakṛti-laghu-rūpād api budhā vidhātrī siddhārthān hari-guṇa-mayī vaḥ kṛtir iyam pulindenāpy agniḥ kim u samidham unmathya janito hiraṇya-śreṇīnām apaharati nāntaḥ-kaluṣatām
[abhivyaktaa mattah prakriti-laghu-roopaad api budhaa vidhaatree siddhaarthaan hari-guna-mayee vah kritir iyam pulindenaapy agnih kim u samidham unmathya janito hiranya-shreneenaam apaharati naantah-kalushataam]
Blended reading (Sanskrit + English inline)
abhivyaktā mattaḥ prakṛti-laghu-rūpād api budhā vidhātrī siddhārthān hari-guṇa-mayī vaḥ kṛtir iyam pulindenāpy agniḥ kim u samidham unmathya janito hiraṇya-śreṇīnām apaharati nāntaḥ-kaluṣatām
“ ‘O learned devotees, I am by nature ignorant and low, yet even though it is from me that the Vidagdha-mādhava has come, it is filled with descriptions of the transcendental attributes of the Supreme Personality of Godhead. Therefore, will not such a literature bring about the attainment of the highest goal of life? Although its wood may be ignited by a low-class man, fire can nevertheless purify gold. Similarly, although I am very low by nature, this book may help cleanse the dirt from within the hearts of the golden devotees.’ ”
Purport
This verse is Vidagdha-mādhava 1.6.
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io