Piaget is also concerned with attempts of Maine de Biran, Bergson, Sartre, and Merleau-Ponty to construct a philosophical psychology as opposed to a … - Jean Piaget

"Gustavo Solivellas dice: "Si un individuo es pasivo intelectualmente, no conseguirá ser libre moralmente" (Jean Piaget)"

We shall simply say then that every action involves an energetic or affective aspect and a structural or cognitive aspect, which, in fact, unites the different points of view already mentioned.

I … sent a program of research to the Rockefeller Foundation. … [Their] questions were almost all of a surprising pertinence. I remember the practical questions … But I particularly remember the theoretical questions, due among others to [Shannon] Weaver, the mathematician interested in information theory who was then in charge of the Department of Science at the Foundation: How will you find interesting epistomological ideas, for example, the theory of relativity, in studying children who know nothing and who in any case are brought up in the intellectual tradition dating from Newton? …

I had the luck to be able to remark … that Einstein himself had advised me in 1928 to study the formation of the intuitions of velocity in order to see if they depended on those of duration, and that further, when I had the good fortune to see Einstein again at Princeton …, he was quite delighted by the reactions of nonconservation of children of four to six years (they deny that a liquid conserves its quantity when it is poured from one glass into another of a different shape: ‘There is more to drink than before,‘ etc.), and was greatly astonished that the elementary concepts of conservation were only constructed toward seven or eight years.