To express the same idea in still another way, I think that human knowledge is essentially active.

I have always detested any departure from reality, an attitude which I relate to my mother's poor mental health.

The most developed science remains a continual becoming

Each time one prematurely teaches a child something he could have discovered himself, that child is kept from inventing it and consequently from understanding it completely.

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.

Every acquisition of accommodation becomes material for assimilation, but assimilation always resists new accommodations.

Reflective abstraction, however, is based not on individual actions but on coordinated actions.