Caitanya-caritāmṛta 20.43
eteka cintite rādhāra nirmala hṛdaya svābhāvika premāra svabhāva karila udaya
[eteka chintite raadhaara nirmala hridaya svaabhaavika premaara svabhaava karila udaya]
Blended reading (Sanskrit + English inline)
eteka cintite rādhāra nirmala hṛdaya svābhāvika premāra svabhāva karila udaya
While Śrīmatī Rādhārāṇī was thinking in this way, the characteristics of natural love became manifest because of Her pure heart.
My note
Source: vedabase.io