In genetic epistemology, as in developmental psychology, too, there is never an absolute beginning.

The current state of knowledge is a moment in history, changing just as rapidly as the state of knowledge in the past has ever changed and, in many instances, more rapidly.

Play is the answer to how anything new comes about.

In other words, knowledge of the external world begins with an immediate utilisation of things, whereas knowledge of self is stopped by this purely practical and utilitarian contact.

How much more precious is a little humanity than all the rules in the world.

I have always detested any departure from reality, an attitude which I relate to my mother's poor mental health.

What is desired is that the teacher ceased being a lecturer, satisfied with transmitting ready-made solutions. His role should rather be that of a mentor stimulating initiative and research.