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

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" 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. "

" 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. "

" 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. "

" 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. "

" 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. "

" The first type of abstraction from objects I shall refer to as simple abstraction, but the second type I shall call reflective abstraction, using this term in a double sense. "

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

" During the first few months of an infant's life, its manner of taking the breast, of laying its head on the pillow, etc., becomes crystallized into imperative habits. This is why education must begin in the cradle. "

" All morality consists in a system of rules, and the essence of all morality is to be sought for in the respect which the individual acquires for these rules. "

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

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

" 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. "

" 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. "

" Play is the work of childhood. "

" 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. "

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

" Everyone knows that at the age of 11-12, children have a marked impulse to form themselves into groups and that the respect paid to the rules and regulations of their play constitutes an important feature of this social life. "

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

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

" 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. "

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

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

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

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

" On the one hand, there are individual actions such as throwing, pushing, touching, rubbing. It is these individual actions that give rise most of the time to abstraction from objects. "

" The more the schemata are differentiated, the smaller the gap between the new and the familiar becomes, so that novelty, instead of constituting an annoyance avoided by the subject, becomes a problem and invites searching. "

" 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. "

" Play is the answer to the question, 'How does anything new come about?' "

" 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. "

" 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. "