Yoga Sutras of Patanjali · 1.47

निर्विचारवैशारद्येऽध्यात्मप्रसादः ॥४७॥

nirvicāravaiśāradye 'dhyātmaprasādaḥ

In mastery of samadhi without reflection, the inner self becomes serene.

— Yoga Sutras of Patanjali 1.47

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).