Yoga Sūtra Chapter Two verse 49
तस्मिन् सति श्वासप्रश्वास्योर्गतिविच्छेदः प्राणायामः ॥४९॥
tasmin-sati-śvāsa-praśvāsayoḥ gati-vicchedaḥ prāṇāyāmaḥ ||49||
Being in this,
dividing the motion of the inhalation and the exhalation
is extending the breath.
Commentaries and Reflections
Commentary by TKV Desikachar:
“Prāṇāyāma leads to this. Pratyāhāra,
to see without the senses distracting or pulling the mind,
and Dhāraṇā –
To see without the mind losing itself,
because of colouring or expectations.
Dhyānam arises out of this.”