"And he will recognise the way"

The reference is to the ancient Egyptian Book of the Dead, and to the instructions given to the soul both by priests and on inscriptions on the walls, sarcophogi and coffins in Egyptian tombs, giving an outline of the underworld, together with invocations that allow the soul of a dead person to "go forth," unnoticed, into the world of the living. Whilst ghosts, in most western traditions, go abroad at night, in the Egyptian tradition they were believed to "go forth" by day, taking the form of birds, reptiles, insects and even plants.