From the Unmanifest originates the Soul; from the Soul has originated the understanding; from the understanding has' originated the mind. When the mind is united with the senses, than it apprehends sound and the other objects of the senses.
अव्यक्तात् प्रसृतं ज्ञानं ततो बुद्धिस्ततो मनः। मनः श्रोत्रादिभिर्युक्तं शब्दादीन् साधु पश्यति॥