This article presents an excerpt from a typed manuscript of one of many lectures Maria Montessori delivered in 1915 in San Francisco, San Diego, and Los Angeles. In this particular lecture, Montessori talked about how teachers can make a profound change in their way of teaching. Instead of doing the traditional lecture, teachers can learn how to be quiet and let their students learn by observation. A teacher must also learn how to contain, to hold back the impulse to intervene, to counsel and advise. Montessori also discussed that the greatest height of the ability of a teacher will be when she reached that point where the children can work entirely alone, without her help in any way.