Yoga Sutras of Patanjali · 2.28

योगाङ्गानुष्ठानादशुद्धिक्षये ज्ञानदीप्तिराविवेकख्यातेः ॥२८॥

yogāṅgānuṣṭhānād aśuddhi-kṣaye jñāna-dīptir āviveka-khyāteḥ

Through the practice of the limbs of yoga, impurity is destroyed; the radiance of knowledge then shines, leading to discriminative discernment.

— Yoga Sutras of Patanjali 2.28

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).