How does the author use foreshadowing in Tartuffe?

In Act II, Orgon description of the joys of marriage with Tartuffe foreshadows the tone of Tartuffe's speeches, which will mix sensuality and piety: "He is most favored by Heaven, and it is a wealth second to none. This marriage will fulfill your desires and will be sugared with sweetness and pleasure. You will live together in a faithful ardor like two children, like two turtledoves."