Themes
A merry heart maketh a cheerful countenance.
— Proverbs • The Bible

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A cheerful spirit inside shows up on the face. The proverb links inner gladness with outward expression, suggesting that a happy heart naturally brightens a person's look and manner, while an outwardly pleasant countenance often has its source in genuine joy.
Context reviewed