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" 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. "

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" Children's games constitute the most admirable social institutions. The game of marbles, for instance, as played by boys, contains an extremely complex system of rules - that is to say, a code of laws, a jurisprudence of its own. "

Jean Piaget

Say

Rules

Game

" The current state of knowledge is a moment in history, changing just as rapidly as the state of knowledge in the past has ever changed and, in many instances, more rapidly. "

" The child of three or four is saturated with adult rules. His universe is dominated by the idea that things are as they ought to be, that everyone's actions conform to laws that are both physical and moral - in a word, that there is a Universal Order. "

" From this time on, the universe is built up into an aggregate of permanent objects connected by causal relations that are independent of the subject and are placed in objective space and time. "

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

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

" Childish egocentrism is, in its essence, an inability to differentiate between the ego and the social environment. "

" Egocentrism appears to us as a form of behavior intermediate between purely individual and socialized behavior. "

Jean Piaget

Individual

Behavior

" The principle goal of education in the schools should be creating men and women who are capable of doing new things, not simply repeating what other generations have done. "

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

" Logic and mathematics are nothing but specialised linguistic structures. "

" Scientific thought, then, is not momentary; it is not a static instance; it is a process. "

" I engage my subjects in conversation, patterned after psychiatric questioning, with the aim of discovering something about the reasoning underlying their right but especially their wrong answers. "

" 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. "

Jean Piaget

Own

Child

" Logical reasoning is an argument which we have with ourselves and which reproduces internally the features of a real argument. "

" Before playing with his equals, the child is influenced by his parents. He is subjected from his cradle to a multiplicity of regulations, and even before language he becomes conscious of certain obligations. "

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

Jean Piaget

Less

Knowing

" I always like to think on a problem before reading about it. "

" Scientific knowledge is in perpetual evolution; it finds itself changed from one day to the next. "

Jean Piaget

Evolution

Knowledge

" From the moral as from the intellectual point of view, the child is born neither good nor bad but master of his destiny. "

" Play is the work of childhood. "

" One of the most striking things one finds about the child under 7-8 is his extreme assurance on all subjects. "

" The goal of education is not to increase the amount of knowledge but to create the possibilities for a child to invent and discover, to create men who are capable of doing new things. "

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

" To reason logically is so to link one's propositions that each should contain the reason for the one succeeding it, and should itself be demonstrated by the one preceding it. Or at any rate, whatever the order adopted in the construction of one's own exposition, it is to demonstrate judgments by each other. "

" The self thus becomes aware of itself, at least in its practical action, and discovers itself as a cause among other causes and as an object subject to the same laws as other objects. "

" Intelligence is what you use when you don't know what to do: when neither innateness nor learning has prepared you for the particular situation. "

" In other words, knowledge of the external world begins with an immediate utilisation of things, whereas knowledge of self is stopped by this purely practical and utilitarian contact. "

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

" This means that no single logic is strong enough to support the total construction of human knowledge. "