Stimuli, however, do not act upon an indifferent organism.

Being able to "go beyond the information" given to "figure things out" is one of the few untarnishable joys of life.

The fish will be the last to discover water.

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.

The shrewd guess, the fertile hypothesis, the courageous leap to a tentative conclusion - these are the most valuable coins of the thinker at work. But in most schools guessing is heavily penalized and is associated somehow with laziness.

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

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.