The middle sister is a big beauty, married to the headmaster, but unhappy in her marriage. He is less cultured and cultivated than she is, now she is grown up.
The youngest sister is young, beautiful and all of the men in the surrounding area are interested in her. Many suitors are n the house looking for her love. Many other men are in the house for the pleasure of being with the 3 sisters who exude aristocratic word play, beauty, joy and sophistication.
Then a married man comes around the house who falls in love with the married sister and they have an affair. One of the things the sisters like about the married man is he always breaking into philosophical statements. So one of the men says of him, he is nice, but he has this regrettable tendency to philosophize.