Play Is The Work Of Childhood.

Moral Autonomy Appears When The Mind Regards As Necessary An Ideal That Is Independent Of All External Pressures.

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.

If Mutual Respect Does Derive From Unilateral Respect, It Does So By Opposition.

Knowing Reality Means Constructing Systems Of Transformations That Correspond, More Or Less Adequately, To Reality.

Teaching Means Creating Situations Where Structures Can Be Discovered.