Commentary Purg XXXIII 72

The word 'moralmente' was understood, even in some of the earliest commentators (e.g., Jacopo della Lana [DDP Lana.Purg.XXXIII.67-72]), as having a technical meaning here, i.e., 'con lo senso tropologico' (with the tropological [i.e, third] sense [of fourfold exegesis of the Bible]).  See allegory .  Various later commentators are of the same opinion, e.g., Tommaseo (DDP Tommaseo.Purg.XXXIII.70-72), Scartazzini (DDP Scartazzini.Purg.XXXIII.72), Poletto (DDP Poletto.Purg.XXXIII.67-72).  What this signifies is that the meaning applies now to current history.  God's original 'interdiction,' broken by Adam, whose sin was redeemed by the cross on which Christ sacrificed Himself, is now binding on us, as well, even though we are at least potentially saved.  Even now we, new Adams, are not meant to eat of the Tree of the Knowledge of Good and Evil.