It is fire or heat that kceps us the vital airs called Prana and the others. Know this heat is called life or the living agent. The heat which keeps up vital airs, is extinguished for the suppression of breath.
प्राणान् धारयते ह्यग्निः स जीव उपधार्यताम्। वायुसंधारणो ह्यग्निर्नश्यत्युच्छ्वासनिग्रहात्॥