Intelligence is what you use when you don't know what to do.
Every acquisition of accommodation becomes material for assimilation, but assimilation always resists new accommodations.
Equilibrium is the profoundest tendency of all human activity.
How much more precious is a little humanity than all the rules in the world.
How can we, with our adult minds, know what will be interesting? If you follow the child...you can find out something new.
Every time we teach a child something, we keep him from inventing it himself. On the other hand, that which we allow him to discover for himself will remain with him visible for the rest of his life.