During a visit to Italy, Hazrat Inayat Khan met with the Italian physician and educator Maria Montessori, and from this anecdote, it seems he also visited one of her schools.
I was very much interested in what Mme. Montessori told me when I was in Italy: that besides all the activities that she gives to children, she makes them keep silence; and after a little time they like it so much that they prefer silence to their activity.
And it interested me still more to see a little girl of about six years of age who, when the time of silence came, went and closed the windows and closed the door, and put away all the things that she was playing with. Then she came and sat in her little chair and closed her eyes, and she did not open them for about three or four minutes. You could see on her innocent face an angelic expression. It seemed she preferred those five minutes of silence to all the playing of the whole day.