People
It is well to remember that grammar is common speech formulated.
— W Somerset Maugham

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Maugham offers a quietly deflating view of grammar, insisting it isn't some lofty invented system but simply ordinary spoken language written down and organized. The comment nudges readers to see rules of usage as descriptive rather than sacred, following speech rather than dictating it.
Context reviewed