At birth, the child leaves a person - his mother's womb - and this makes him independent of her bodily functions. The baby is next endowed with an urge, or need, to face the out world and to absorb it. We might say that he is born with 'the psychology of world conquest.' By absorbing what he finds about him, he forms his own personality.

Within the child lies the fate of the future. Whoever wishes to confer some benefit on society must preserve him from deviations and observe his natural ways of acting. A child is mysterious and powerful and contains within himself the secret of human nature.

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

The child's conquests of independence are the basic steps in what is called his 'natural development'.

To give a child liberty is not to abandon him to himself.

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

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.