Yoga Sutras of Patanjali · 2.52

ततः क्षीयते प्रकाशावरणम् ॥५२॥

tataḥ kṣīyate prakāśāvaraṇam

From pranayama, the covering over the inner light is destroyed.

— Yoga Sutras of Patanjali 2.52

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).