Where do the demons live?

Are these spirits devils or men, and if the latter, why do they do it?

These are just men and women, who, like many evil persons on earth, hate to see old companions leave them for the paths of rectitude.

The beings you designate as devils are seldom found except in the lowest depths.

The vices personified are, however, found in each division to which they are appropriate. The upper realms of Hell are almost entirely occupied by men.