The sacrifices formed by Yoga is going on as regards myself. The spring whence that sacrifice proceeds is that which gives the fire of knowledge. The upward vital air Prana is the Stotra of that sacrifice. The downward vital air Apana is its Shastra. The renunciation of everything is the excellent present of that sacrifice.
योगयज्ञः प्रवृत्ते मे ज्ञानवह्निप्रदोद्भवः। प्राणस्तोत्रोऽपानशस्त्रः सर्वत्यागसुदक्षिणः॥