It is with children that we have the best chance of studying the development of logical knowledge, mathematical knowledge, physical knowledge, and so forth.
Jean PiagetHow can we, with our adult minds, know what will be interesting? If you follow the child...you can find out something new.
Jean PiagetLogical positivists have never taken psychology into account in their epistemology, but they affirm that logical beings and mathematical beings are nothing but linguistic structures.
Jean Piaget