Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality.
Jean Piaget

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.
Jean Piaget

This means that no single logic is strong enough to support the total construction of human knowledge.
Jean Piaget

The self thus becomes aware of itself, at least in its practical action, and discovers itself as a cause among other causes and as an object subject to the same laws as other objects.
Jean Piaget

The principle goal of education in the schools should be creating men and women who are capable of doing new things, not simply repeating what other generations have done.
Jean Piaget

It is with children that we have the best chance of studying the development of logical knowledge, mathematical knowledge, physical knowledge, and so forth.
Jean Piaget

On the one hand, there are individual actions such as throwing, pushing, touching, rubbing. It is these individual actions that give rise most of the time to abstraction from objects.
Jean Piaget

The first type of abstraction from objects I shall refer to as simple abstraction, but the second type I shall call reflective abstraction, using this term in a double sense.
Jean Piaget