The main characteristic of play - whether of child or adult - is not it content but its mode. Play is an approach to action, not a form of activity.

In reference to right answers - Knowing is a process, not a product.

Education must, be not only a transmission of culture but also a provider of alternative views of the world and a strengthener of the will to explore them.

Grasping the structure of a subject is understanding it in a way that permits many other things to be related to it meaningfully. To learn structure in short, is to learn how things are related.

We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.

Teaching is the canny art of intellectual temptation

The essence of creativity is figuring out how to use what you already know in order to go beyond what you already think.