They who are conversant with sacrifices know that Samana and Vyana are from the quality of Goodness, Prana and Apana are portions of the oblation (of clarified butter). Between them is the Fire.
सत्त्वात् समानो व्यानश्च इति यज्ञविदो विदुः। प्राणापानावाज्यभागौ तयोर्मध्ये हुताशनः॥