yathā sthiram acañcalam

pranasya-of vital air; sodhayet-one should clear; margam-the passage; pura-kumbhaka-recakaih-by inhaling, retaining, and exhaling; pratikulena-by reversing; va-or; cittam-the mind; yatha-so that; sthiram-steady; acancalam-free from disturbances.