People
It is not hard work which is dreary; it is superficial work.
— Edith Hamilton

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker separates demanding work from shallow work and assigns dreariness to the latter. The distinction challenges the idea that difficulty alone makes a task dull. In this view, what drains interest is the lack of depth, rather than the amount of effort required.
Context reviewed