Themes
I thought I could describe a state; make a map of sorrow. Sorrow however turns out to be not a state but a process.
— C.S. Lewis • A Grief Observed

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Lewis expected grief to be something he could chart. He found it doesn't hold still like a place on a map. It keeps moving and changing, so sorrow can only be lived through, not pinned down.
Context reviewed