Logical positivists have never taken psychology into account in their epistemology, but they affirm that logical beings and mathematical beings are nothing but linguistic structures.

As you know, Bergson pointed out that there is no such thing as disorder but rather two sorts of order, geometric and living.

During the earliest stages the child perceives things like a solipsist who is unaware of himself as subject and is familiar only with his own actions.

In genetic epistemology, as in developmental psychology, too, there is never an absolute beginning.

Logic and mathematics are nothing but specialised linguistic structures.

Our problem, from the point of view of psychology and from the point of view of genetic epistemology, is to explain how the transition is made from a lower level of knowledge to a level that is judged to be higher.

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