As the text 'these are all alike, all infinite' (Bri. Up. I, 5, 13),
declares speech, mind, and breath to be infinite, we conclude that the
prânas are all-pervading.--To this the Sûtra replies, that they are
minute; for the text 'when the vital breath passes out of the body, all
the prânas pass out after it' (Bri. Up. V, 4, 2), proves those prânas to
be of limited size, and as when passing out they are not perceived by
bystanders, they must be of minute size--The text which speaks of them
as infinite is a text enjoining meditation ('he who meditates on them as
infinite'), and infinity there means only that abundance of activities
which is an attribute of the prâna to be meditated on.