If Freewill cannot alter visible Evil, how can it alter spiritual Evil, a bound Nature ?

But if they say that these Natures in which there is mixed an excrement have 110 Freewill whereby they may separate the Foulness from them, let us leave them a little. Even if we wander a little from our subject, let us go with them where they call us. For Truth on account of its strength goes wherever it is led as a victor, and where it is pressed towards a defeat, there it gains the better crown. Let us leave, therefore, the 'bound Natures' and let us come to 'the independent Minds' ; let us see if the Wills of these men in whom there is Freedom can separate and send out of themselves the evil Ingredient, that by (the example of) the visible Mixing of the visible Evil we may believe that also the invisible Mixing of the invisible Evil can be separated. [Ov. p. 50, 1. 12.] If there is a quantity of harmful poison or deadly phlegm in any of these men, let them tell us : will 'the blameless Conduct of Freedom' separate this Evil, or will drugs and medicinal roots ? Does not this fact refute them (and convince them) that the harmfulness which I have mentioned cannot be separated by 'the righteousness of Freedom,' but by medicinal skill ? If, therefore, this small Evil which is mingled with us is not expelled from us by 'blameless Conduct,' but by the virtue of drugs, how can' Commandments and Laws' separate that mighty and powerful Evil which is mixed in Souls ? For, behold, as experience teaches us, (medicinal) virtue can separate from us even the Evil which we have mentioned by means of skilful (medical) methods, and not by the 'Conduct of Freedom.' For if they talk such nonsense let no one hear those who would relate empty tales to foolish minds. [Ov. p. 51.] For empty allegories are believed (only) by one whose mind is empty as regards the Truth.