Yoga Sutras of Patanjali · 3.41

श्रोत्राकाशयोः सम्बन्धसंयमाद्दिव्यं श्रोत्रम्॥४१॥

śrotra-ākāśayoḥ sambandha-saṁyamād divyaṁ śrotram

By sanyama on the relationship between the ear and space, divine hearing arises.

— Yoga Sutras of Patanjali 3.41

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).