For seeing that in the soul we have a worse and a better part and the worse is always for the sake of the better, as in the case of body and soul the body is for the sake of the soul, and we shall say that we have our body in a good state, when its state is such as not to hinder, but actually to help and take part in inciting towards the soul accomplishing its own work (for the worse is for the sake of the better, to aid the better in its work); when, then, the passions do not hinder the mind from performing its own work, then you will have what is done in accordance with right reason.