Good teaching is forever being on the cutting edge of a child's competence.

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.

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.

Telling others about oneself is...no simple matter. It depends on what we think they think we ought to be like

Understanding something in one way does not preclude understanding it in other ways.

In the perception of the incongruous stimuli, the recognition process is temporarily thwarted and exhibits characteristics which are generally not observable in the recognition of more conventional stimuli.

Knowledge helps only when it descends into habits.