As desire, and so on, are not principles different from mind, although
they are different functions and produce different effects--according to
the text, 'Desire, purpose, doubt, faith, want of faith, firmness,
absence of firmness, shame, reflection, fear--all this is mind' (Bri. Up.
I, 5, 3); so, on the ground of the text, 'prâna, apâna, vyâna, udâna,
samâna--all this is prâna' (ibid.), apâna and the rest must be held to
be different functions of prâna only, not independent principles.--Here
terminates the adhikarana of what is 'a modification of air.'