CC Madhya 21.114

sakhi he, kon tapa kaila gopī-gaṇa
kṛṣṇa-rūpa-sumādhurī, pibi’ pibi’ netra bhari’,
ślāghya kare janma-tanu-mana
Synonyms: 
sakhi he — my dear friend; kon — what; tapa — austerity; kaila — have executed; gopī-gaṇa — all the gopīs; kṛṣṇa-rūpa — of the beauty of Lord Kṛṣṇa; su-mādhurī — the essence of all sweetness; pibi’ pibi’ — drinking and drinking; netra bhari’ — filling the eyes; ślāghya kare — they glorify; janma-tanu-mana — their births, bodies and minds.
Translation: 
“O my dear friend, what severe austerities have the gopīs performed to drink His transcendental beauty and sweetness through their eyes in complete fulfillment? Thus they glorify their births, bodies and minds.