Śivasaṃhitā 3.25

The instruction to release breath through the right nostril slowly and without force encapsulates a governing principle of classical prāṇāyāma: subtlety over strength. The breath is not expelled but released, the way a skilled musician resolves a phrase — with intention, not urgency. This quality of release determines the depth of the next retention.

The adverb śanaiḥ (‘slowly, gradually’) and its implicit contrast with vegataḥ (‘with speed, force’) establish a crucial technical distinction. Forceful exhalation scatters prāṇa rather than refining it. This pair of terms recurs across Haṭha literature as a shorthand for the difference between practice that cultivates and practice that depletes — a distinction the tradition takes with great seriousness.

Modern respiratory physiology supports the intuition embedded in this instruction: slow, controlled exhalation activates parasympathetic tone, reduces cortisol, and prepares the nervous system for deeper breath retention. The Śivasaṃhitā arrived at this recommendation through centuries of careful observation rather than laboratory measurement, yet the convergence between traditional practice and contemporary science here is striking and instructive.