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

It is well to cultivate a friendly feeling towards error, to treat it as a companion inseparable from our lives, as something having a purpose, which it truly has.

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

An interesting piece of work, freely chosen, which has the virtue of inducing concentration rather than fatigue, adds to the child's energies and mental capacities, and leads him to self-mastery.

It is not in human nature for all men to tread the same path of development, as animals do of a single species.

Childhood constitutes the most important element in an adult's life, for it is in his early years that a man is made.

The child can only develop fully by means of experience in his environment. We call such experience 'work'.