In One Sentence: Evensong by Lester del Rey

An allegory about human’s role in the universe.

It was a peaceful world, he realized, and the fear thickened in him at the discovery. In his younger days, he had cherished a multitude of worlds where the game of life’s ebb and flow could be played to the hilt. It had been a lusty universe to roam then.

—Lester del Rey, Evensong