The Sayings of the Overseer is a book mentioned, but not found, in Dishonored. Two of its sayings can be found in the Office of the High Overseer, and they follow the teachings of the Abbey of the Everyman.
The Sayings of the Overseer
"Keep both hands on the plow, lest the Outsider find use for them."
The Sayings of the Overseer, 13
The Sayings of the Overseer, 211
The two sayings can be found throughout the Office of the High Overseer, etched into the walls. Locations include outside the main entrance of the building on the walls of the platforms held up by columns, in the foyer, and on the second floor in a corner by the stairs.