Yoga Rahasya Chapter One verse 45

āsanena vinā prāṇāyāmaḥ sidhyati na eva hi |
vinā prāṇa nirodhena na manaḥ sthiratāṃ vrajet ||

Without āsana, truly, prāṇāyāma cannot become accomplished.
Without containing prāṇa, the mind cannot achieve steadiness.

vinā - withoutāsana - postureprāṇāyāma - extending the breathsiddhi - accomplishment, performance, fulfilment, attainment, successeva - thusprāṇa - breath, inward air, vital forcenirodha - to contain, enclose, confine, restrainmanas - mindsthira - steadyvrajet - can achieve

Commentaries and Reflections

Paul Harvey:

“Without Āsana,
Prāṇāyāma cannot become accomplished.
Without containing Prāna,
the mind cannot achieve steadiness.”