वायुः परिचितो यस्मादग्निना सह कुण्डलीम् । बोधयित्वा सुषुम्णायां प्रविशेदनिरोधतः ॥ ४.१९ ॥

vāyuḥ paricito yasmādagninā saha kuṇḍalīm । bodhayitvā suṣumṇāyāṃ praviśedanirodhataḥ ॥ 4.19 ॥

The Vâyu should be made to enter the Sushumnâ without restraint by one who has practised breath control and has awakened the Kundali by means of the (gastric) fire.