Verse 13

अन्तःप्राणपरिस्पन्दात्संकल्पकलनोन्मुखी ।संवित्संजायते यैषा तच्चित्तं विद्धि राघव

In plain words

From the inward vibration of prāṇa, that saṃvid which arises, turning toward the shaping of saṃkalpa -- know that, Rāghava, to be citta.