Verse 27

चित्तोपशान्तिफलदं परमं साम्यकारणम् ।सुभगं संविदः स्वास्थ्यं प्राणसरोधनं विदुः

In plain words

The restraining of prāṇa, they know, yields the fruit of citta's stilling, the supreme cause of equanimity, the blessed well-being of saṃvit.