Thus is heat placed in the vital air called Prana and Apana and others, of all embodied creatures. That heat is always burning thcre like a fire placed in vessel which can be seen.
एवं सर्वेषु विहितः प्राणापानेषु देहिनाम्। तस्मिन् समिध्यते नित्यमग्निः स्थाल्यामिवाहितः॥