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

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

Punishment renders autonomy of conscience impossible.

What the genetic epistemology proposes is discovering the roots of the different varieties of knowledge, since its elementary forms, following to the next levels, including also the scientific knowledge.

It is with children that we have the best chance of studying the development of logical knowledge, mathematical knowledge, physical knowledge, and so forth.

Logic and mathematics are nothing but specialised 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.