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.

If we try to think back to the dim and distant past... what is it that helps us reconstruct those times, and to picture the lives of those who lived in them? It is their art... It is thanks to the hand, the companion of the mind, that civilization has arisen.

No social problem is as universal as the oppression of the child ... No slave was ever so much the property of his master as the child is of his parent ... Never were the rights of man ever so disregarded as in the case of the child.

The child’s parents are not his makers but his guardians.

The child, in fact, once he feels sure of himself, will no longer seek the approval of authority after every step.

Under the urge of nature and according to the laws of development, though not understood by the adult, the child is obliged to be serious about two fundamental things ... the first is the love of activity... The second fundamental thing is independence.

The principal agent is the object itself and not the instruction given by the teacher. It is the child who uses the objects; it is the child who is active, and not the teacher.