Note 552 — CANTO XX.
James Romanes Sibbald translation
The visible profound: The Fourth Bolgia, where soothsayers of every kind are punished. Their sin is that of seeking to find out what God has made secret. That such discoveries of the future could be made by men, Dante seems to have had no doubt; but he regards the exercise of the power as a fraud on Providence, and also credits the adepts in the black art with ruining others by their spells (line 123).