mayi bhaktir hi bhūtānām
amṛtatvāya kalpate
diṣṭyā yad āsīn mat-sneho
bhavatīnāṁ mad-āpanaḥ
mayi - unto Me; bhaktiḥ - the nine kinds of devotional service, such as śravaṇa, kīrtana and smaraṇa; hi - certainly; bhūtānām - of all living entities; amṛtatvāya - for becoming eternal associates of the Lord; kalpate - is quite befitting; diṣṭyā - by good fortune; yat - whatever; āsīt - there was; mat-snehaḥ - love and affection for Me; bhavatīnām - of all you gopīs; mat-āpanaḥ - the cause for getting Me back.
This is a verse from Śrīmad-Bhāgavatam (10.82.44).