In the late 1950s Tolkien returned to The Silmarillion, but much of his writing from this time was concerned more with the theological and philosophical underpinnings of the work than with the narratives themselves.
Tolkien vendte i de sene 1950'ere tilbage til Silmarillion, men hans skriftlige arbejde fra denne tid drejede sig i højere grad om det teologiske og filosofiske fundament under bogen end selve fortællingerne.