Books
My fair one, let us swear an eternal friendship.
— Molière · Le Bourgeois Gentilhomme

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A grand, slightly theatrical proposal. The speaker addresses someone as "my fair one" and suggests they swear eternal friendship, treating an oath like a ceremony. It's a courtly gesture, and the wording leaves it open whether it's sincere or a bit of flattery.
Context reviewed