Intelligence is what you use when you don't know what to do.
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.
Punishment renders autonomy of conscience impossible.
To express the same idea in still another way, I think that human knowledge is essentially active.
Children require long, uniterrupted periods of play and exploration
The more the schemata are differentiated, the smaller the gap between the new and the familiar becomes, so that novelty, instead of constituting an annoyance avoided by the subject, becomes a problem and invites searching.