Yoga Sutras of Patanjali · 3.47

ग्रहणस्वरूपास्मितान्वयार्थवत्त्वसंयमादिन्द्रियजयः॥४७॥

grahaṇa-svarūpa-asmitā-anvaya-arthavattva-saṁyamād indriya-jayaḥ

By sanyama on the process of perception, its essential nature, the I-am-ness within it, its interpenetration with the gunas, and its purposiveness — mastery of the senses arises.

— Yoga Sutras of Patanjali 3.47

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).