Yoga Sutras of Patanjali · 2.41

सत्त्वशुद्धिसौमनस्यैकाग्र्येन्द्रियजयात्मदर्शनयोग्यत्वानि च ॥४१॥

sattva-śuddhi-saumanasya-ikāgryendriya-jayātma-darśana-yogyatvāni ca

Further fruits of shaucha are purification of the inner essence, cheerfulness of mind, one-pointedness, mastery of the senses, and fitness for the vision of the Self.

— Yoga Sutras of Patanjali 2.41

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).