Srimad Bhagavatam Canto 08, Chapter 19, Text 26

SB 8.19.26

yadrccha-labha-tustasya
 tejo viprasya vardhate
tat prasamyaty asantosad
 ambhasevasusuksanih
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A brahmana who is satisfied with whatever is providentially obtained is increasingly enlightened with spiritual power, but the spiritual potency of a dissatisfied brahmana decreases, as fire diminishes in potency when water is sprinkled upon it.
Srimad Bhagavatam Canto 08, Chapter 19, Text 25
Srimad Bhagavatam Canto 08, Chapter 19, Text 27