Well, the response is correct, but it can be misunderstood. Also the fact that the Fathers didn't have a stable terminology for
the aspects of the soul doesn't help either.
We should say here that the correct control can be reached only through God's grace and only avoiding sin - that is departing from God because of a love which can start to become distorted, that is a direct relation between the two lovers in which God doesn't have place anymore, however because we are in a
circular world this relation cannot really exist. See the case with Avraam and his son Isaac and commentaries of the Fathers as per why God told him to kill his son. Still relevant today, of course.
So we must not understand bare rationality by this control of the mind - btw,
@ArmyMatt what do you understand by "mind"? - but rather the enlightenment of the eye of the soul which uses correctly the irrational aspects of the soul (see the link about the aspects above) in order to manage correctly the emotions in order to make good to myself and the others that is to bring everyone closer to God, the eternal personal perfection.