Yoga Sutras of Patanjali · 1.35

विषयवती वा प्रवृत्तिरुत्पन्ना मनसः स्थितिनिबन्धनी ॥३५॥

viṣayavatī vā pravṛttirutpannā manasaḥ sthitinibandhanī

Or, by the arising of a refined perception of a subtle object, which binds the mind to steadiness.

— Yoga Sutras of Patanjali 1.35

Source: Sanskrit attributed to Patanjali (c. 2nd century BCE – 4th century CE). Public-domain English readings drawn from Swami Vivekananda's 'Raja Yoga' (1896) and Charles Johnston's 'The Yoga Sutras of Patanjali' (1912).