One need not be a chamber to be haunted

One need not be a chamber - to be Haunted -
One need not be a House -
The Brain - has Corridors surpassing
Material Place -

Far safer of a Midnight - meeting
External Ghost -
Than an Interior - confronting -
The Whiter Host.The cooler - Host -

Far safer, through an Abbey - gallop -
The Stones a'chase -
Than moonless - One's A'self encounter -
In lonesome place -

Ourself - behind Ourself - Concealed -
Should startle - most -
Assassin - hid in Our Apartment -
Be Horror's least -

The BodyThe Prudent - carriesthe a Revolver -
He bolts the Door -
A Spectre - infinite - accompanying -O'erlooking a Superior Spectre -
He fails to fear -More near