Read it through once

The gentleman’s playful mood began to disappear—one could see that, by his face. Joan’s earnestness was affecting him. It always happened that people who began in jest with her ended by being in earnest. They soon began to perceive depths in her that they had not suspected; and then her manifest sincerity and the rocklike steadfastness of her convictions were forces which cowed levity, and it could not maintain its self-respect in their presence. The Sieur de Metz was thoughtful for a moment or two, then he began, quite soberly: