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" 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. "

Related Quotes:

" The main functions of intelligence, that of inventing solutions and that of verifying them, do not necessarily involve one another. The first partakes of imagination; the second alone is properly logical. "

Jean Piaget

Intelligence

Alone

First

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

" 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. "

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

" 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. "

" Logical activity is not the whole of intelligence. One can be intelligent without being particularly logical. "

" 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. "

" To accustom the infant to get out of its own difficulties or to calm it by rocking it may be to lay the foundations of a good or of a bad disposition. "

" 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. "

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

" With regard to moral rules, the child submits more or less completely in intention to the rules laid down for him, but these, remaining, as it were, external to the subject's conscience, do not really transform his conduct. "

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

" The child often sees only what he already knows. He projects the whole of his verbal thought into things. He sees mountains as built by men, rivers as dug out with spades, the sun and moon as following us on our walks. "

" 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. "

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

Jean Piaget

Evolution

Knowledge

" 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. "

" 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. "

" 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. "

" 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. "

" 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. "

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

" 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. "

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

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

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

" 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

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

" The practice of narrative and argument does not lead to invention, but it compels a certain coherence of thought. "

" 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. "