Srimad-Bhagavatam: Canto 8 - Chapter 1 - Verse 26
Sanskrit:
यदृच्छालाभतुष्टस्य तेजो विप्रस्य वर्धते ।तत् प्रशाम्यत्यसन्तोषादम्भसेवाशुशुक्षणि: ॥ २६ ॥
ITRANS:
yadṛcchā-lābha-tuṣṭasyatejo viprasya vardhatetat praśāmyaty asantoṣādambhasevāśuśukṣaṇiḥ
Translation:
A brāhmaṇa who is satisfied with whatever is providentially obtained is increasingly enlightened with spiritual power, but the spiritual potency of a dissatisfied brāhmaṇa decreases, as fire diminishes in potency when water is sprinkled upon it.