Bhagavad Gita · Chapter 18: Freedom through Renunciation

Bhagavad Gita 18.34

yayā tu dharmakāmārthān dhṛtyā dhārayate'rjuna | prasaṅgena phalākāṅkṣī dhṛtiḥ sā pārtha rājasī ||

But the steadfastness by which a person holds on to duty, pleasure, and wealth, Arjuna, craving their fruits out of attachment: that steadfastness is of passion.

Modern context

Rajasic steadfastness holds on to duty, pleasure and wealth, but out of attachment and craving for results. Such a person can be very persistent, but their persistence is driven by wanting. They keep going as long as rewards keep coming. When the rewards stop, so does the steadfastness.