Of all things love is the most potent.

Free choice is one of the highest of all the mental processes.

Children are not only sensitive to silence, but also to a voice which calls them ... Out of that silence.

No adult can bear a child’s burden or grow up in his stead.

Every great cause is born from repeated failures and from imperfect achievements.

As soon as children find something that interests them they lose their instability and learn to concentrate.

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.