Themes
Wear a smile and have friends; wear a scowl and have wrinkles. What do we live for if not to make the world less difficult for each other?
— George Eliot

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker links outlook to consequences: a warm face draws companions, while a sour one merely etches lines. Then comes the larger question of purpose, suggesting that life's point lies in easing each other's burdens. Small courtesies and cheerfulness become part of a shared responsibility rather than mere pleasantries.
Context reviewed