Going away describes the letting go of the old self a person has clung to, the concept he keeps rehearsing about himself. While he holds tight to that familiar identity, nothing new can enter, and the state he longs for stays out of reach. The departure of the old is the price of the arrival of the new. What leaves is the self he knows.
The Comforter is the inner remembrancer, the settled feeling of the wish fulfilled, which rises only once the former self-image is released. Assumption and abandonment are one motion: as the old is dropped, the new is sent in its place, and it comes to abide. A person cannot occupy the fulfilled state while still standing in the empty one. He releases what he was, and the thing he wanted comes to stay.