Then sound, which is the attribute of space, is swallowed up by Mind which is the essence of all manifest things. Thus Mind which in itself is unmanifest withdraws all that is manifested by Mind. This withdrawal of manifest Mind into unmanifest Mind, is called the destruction of the external universe.
आकाशस्य गुणं शब्दमभिव्यक्तात्मकं मनः। मनसो व्यक्तमव्यक्तं ब्राह्मः सम्प्रतिसंचरः॥