But these opinions are not only contrary to appearance, but repugnant one to another. For they themselves
chiefly make use of those divisions of tetrachords in which
most of the intervals are either unequal or irrational. To
which purpose they always soften both lichanos and paranete, and lower even some of the standing sounds by an
irrational interval, bringing the trite and paranete to approach them. And especially they applaud the use of
those systems in which most of the intervals are irrational,
by relaxing not only those tones which are by nature movable, but also some which are properly fixed; as it is plain
to those that rightly understand these things.