Books
Beware the fury of a patient man.
— John Dryden · Absalom and Achitophel

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A warning that calm, long-suffering people are not to be underestimated. Someone who has patiently endured may carry stored-up anger, and when it finally breaks it can be far more forceful than a hot-tempered outburst. The line treats patience as restraint that can turn formidable.
Context reviewed