CC Madhya-lila 19.141 - Svetasvatara Upanisad
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 19.141, Translation and Purport:
“"If we divide the tip of a hair into one hundred parts and then take one part and divide this into another one hundred parts, that ten-thousandth part is the dimension of the living entity. This is the verdict of the chief Vedic mantras."
The first three padas of this verse from the Pañcadaśī-citra-dīpa (81) are taken from the Śvetāśvatara Upaniṣad (5.9).