He who experiments must, while doing so, divest himself of every preconception. It is clear then that if we wish to make use of a method of experimental psychology, the first thing necessary is to renounce all former creeds and to proceed by means of the method in the search for truth.

Do not tell them how to do it. Show them how to do it and do not say a word. If you tell them, they will watch your lips move. If you show them, they will want to do it themselves.

Concentration is the key that opens up to the child the latent treasures within him.

Times have changed, and science has made great progress, and so has our work; but our principles have only been confirmed, and along with them our conviction that mankind can hope for a solution to its problems, among which the most urgent are those of peace and unity, only by turning its attention and energies to the discovery of the child and to the development of the great potentialities of the human personality in the course of its formation.

What advice can we give to new mothers? Their children need to work at an interesting occupation: they should not be helped unnecessarily, nor interrupted, once they have begun to do something intelligent.

A child's character develops in accordance with the obstacles he has encountered... or the freedom favoring his development that he has enjoyed.

The greatest triumph of our educational method should always be this: to bring about the spontaneous progress of the child.