All the great amusements are dangerous for the Christian life. But among all the amusements that the world has invented, none is to be more feared than the theatre. Drama is such a realistic and sensitive representation of the passions that it excites them, and gives birth to such passions in our heart. This is especially true of the passion of love, chiefly when the playwright presents it as chaste and virtuous; for the more innocent the passion seems to innocent natures, the more capable they are of being touched. At the same time, they form their conscience on the decency of these sentiments, and they imagine that no harm can come from a love so good. So they leave the theatre with their hearts so full of all the sweetness of love, and the mind so convinced of its innocence, that they are ready to receive their first emotions - or, rather, to seek out the opportunity to arouse such feelings in someone's heart, in order to receive the same pleasures and the same sacrifices that they have seen so aptly shown on the stage.
Source: the Marquise Sablé’s work is in Maxims and Various Thoughts (Maximes et pensées diverses) 1678
Contributed by: Zaady