Verse 18

प्राणस्पन्दनसुप्ता च तच्छान्तिं शान्तिरुच्यते ।प्राणसंस्पन्दनात्संविद्याति वीटेव चोदिता

In plain words

And [saṃvit], when the pulsation of prāṇa is asleep, is stilled: that stilling of it is called peace. From the pulsation of prāṇa, saṃvit goes forth like a ball that has been struck.