One verse

Srimad Bhagavatam 8.19.26

8.19.26

यद‍ृच्छालाभतुष्टस्य तेजो विप्रस्य वर्धते । तत् प्रशाम्यत्यसन्तोषादम्भसेवाशुशुक्षणि: ॥ २६ ॥

yadrccha-labha-tustasya tejo viprasya vardhate tat prasamyaty asantosad ambhasevasusuksanih

yadrccha-labha-tustasya
who is satisfied by things obtained by the grace of God
tejah
the brilliant effulgence
viprasya
of a brahmana
vardhate
increases
tat
that (effulgence)
prasamyati
is diminished
asantosat
because of dissatisfaction
ambhasa
by pouring of water
iva
as
asusuksanih
a fire.

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.