Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 18
Sanskrit:
भजन्त्यभजतो ये वै करुणा: पितरौ यथा ।धर्मो निरपवादोऽत्र सौहृदं च सुमध्यमा: ॥ १८ ॥
ITRANS:
bhajanty abhajato ye vaikaruṇāḥ pitarau yathādharmo nirapavādo ’trasauhṛdaṁ ca su-madhyamāḥ
Translation:
My dear slender-waisted gopīs, some people are genuinely merciful or, like parents, naturally affectionate. Such persons, who devotedly serve even those who fail to reciprocate with them, are following the true, faultless path of religion, and they are true well-wishers.