In genetic epistemology, as in developmental psychology, too, there is never an absolute beginning.

Logical positivists have never taken psychology into account in their epistemology, but they affirm that logical beings and mathematical beings are nothing but linguistic structures.

True interest appears when the self identifies itself with ideas or objects, when it finds in them a means of expression and they become a necessary form of fuel for its activity.

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

Teaching means creating situations where structures can be discovered.

I could not think without writing.

When you teach a child something you take away forever his chance of discovering it for himself.