On this page, we want to take a speculative approach to interpreting the Mansion as a Prison and a Mental Asylum. Kudos to GOG Forum user who quite eloquently formulated this idea:
The house is the institution. There are many locked doors, even the front door is locked. Just like in the institution, Adam is trapped. Belial also tricks Adam once and traps him in a small cell that's like a one in an institution. Even the chair is bolted down. There are 2 doors to this cell in the Delusion though, an oddity that must mean something.
Warded Doors = Locked Cells
Ending Cutscene: Adam in straight-jacket