Srimad Bhagavatam Canto 08, Chapter 17, Text 17

SB 8.17.17

athapy upayo mama devi cintyah
 santositasya vrata-caryaya te
mamarcanam narhati gantum anyatha
 sraddhanurupam phala-hetukatvat
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Yet because I have been satisfied by the activities of your vow, O goddess Aditi, I must find some means to favor you, for worship of Me never goes in vain but certainly gives the desired result according to what one deserves.
Srimad Bhagavatam Canto 08, Chapter 17, Text 16
Srimad Bhagavatam Canto 08, Chapter 17, Text 18