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

To understand is to invent.

Chance... in the accommodation peculiar to sensorimotor intelligence, plays the same role as in scientific discovery. It is only useful to the genius and its revelations remain meaningless to the unskilled.

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

Children require long, uniterrupted periods of play and exploration

Children have real understanding only of that which they invent themselves, and each time that we try to teach them too quickly, we keep them from reinventing it themselves.

Intelligence is what you use when you don't know what to do.