CC Madhya 19.139

keśāgra-śateka-bhāga punaḥ śatāṁśa kari
tāra sama sūkṣma jīvera ‘svarūpa’ vicāri
Synonyms: 
keśa-agra — from the tip of a hair; śata-eka — one hundred; bhāga — divisions; punaḥ — again; śata-aṁśa — one hundred divisions; kari — making; tāra sama — equal to that; sūkṣma — very fine; jīvera — of the living entity; svarūpa — the actual form; vicāri — I consider.
Translation: 
“The length and breadth of the living entity is described as one ten-thousandth part of the tip of a hair. This is the original subtle nature of the living entity.