Moral autonomy appears when the mind regards as necessary an ideal that is independent of all external pressures.

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

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.

How much more precious is a little humanity than all the rules in the world.

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

Experience precedes understanding.

To understand is to invent.