Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 14
Sanskrit:
यदा जयेत्तम: सत्त्वं रज: सङ्गं भिदा चलम् ।तदा दु:खेन युज्येत कर्मणा यशसा श्रिया ॥ १४ ॥
ITRANS:
yadā jayet tamaḥ sattvaṁrajaḥ saṅgaṁ bhidā calamtadā duḥkhena yujyetakarmaṇā yaśasā śriyā
Translation:
When the mode of passion, which causes attachment, separatism and activity, conquers ignorance and goodness, a man begins to work hard to acquire prestige and fortune. Thus in the mode of passion he experiences anxiety and struggle.