Ever eating, never cloying, All-devouring, all-destroying, Never finding full repast, Till I eat the world at last.

Why this works

This riddle cleverly personifies "Time" as a voracious entity that is always consuming. The phrases "ever eating" and "all-devouring" highlight how time continuously moves forward, affecting everything in its path without ever being satisfied. The line "never finding full repast" suggests that time never reaches a conclusion or finality; it keeps on progressing indefinitely. Ultimately, the idea of time "eating the world" signifies its relentless nature, as everything is subject to the passage of time, making it an all-consuming force.