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But no mental action seems necessary or invariable in its character. In whatever manner the mind has reacted under a given sensation, in that manner it is the more likely to react again; were this, however, an absolute necessity, habits would become wooden and ineradicable, and no room being left for the formulation of new habits, intellectual life would come to a speedy close. Thus, the uncertainty of the mental law is no mere defect of it, but is on the contrary of its essence. The truth is, the mind is not subject to "law," in the same rigid sense that matter is. It only experiences gentle forces which merely render it more likely to act a given way than it otherwise would be. There always remains a certain amount of arbitrary spontaneity in its action, without which it would be dead.

 

Charles Sanders Peirce

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Any character or proposition either concerns one subject, two subjects, or a plurality of subjects. For example, one particle has mass, two particles attract one another, a particle revolves about the line joining two others. A fact concerning two subjects is a dual character or relation; but a relation which is a mere combination of two independent facts concerning the two subjects may be called degenerate, just as two lines are called a degenerate conic. In like manner a plural character or conjoint relation is to be called degenerate if it is a mere compound of dual characters.
A sign is in a conjoint relation to the thing denoted and to the mind. If this triple relation is not of a degenerate species, the sign is related to its object only in consequence of a mental association, and depends upon a habit. Such signs are always abstract and general, because habits are general rules to which the organism has become subjected. They are, for the most part, conventional or arbitrary. They include all general words, the main body of speech, and any mode of conveying a judgment. For the sake of brevity I will call them tokens.

 

Charles Sanders Peirce

 

Between the various types of rules which we shall give there will therefore be at once continuity of function and difference of structure. This renders arbitrary any attempt to cut mental reality up into stages. The matter is further complicated by the "Law of conscious realization" and the resulting time-lag. The appearance of a new type of rule on the practical plane does not necessarily mean that this rule will come into the subject's consciousness, for each mental operation has to be relearned on the different planes of action and of thought.

 

Jean Piaget

 

Piety, then, needs a counterpoise, something to prevent it from being exercised in an excessively rigid way; and this it has, in most intellectual temperaments, in the quality I would call playfulness. We speak of the play of the mind; and certainly the intellectual relishes the play of the mind for its own sake, and finds in it one of the major values in life. What one thinks of here is the element of sheer delight in intellectual activity. Seen in this guise, intellect may be taken as the healthy animal spirits of the mind, which come into exercise when the surplus of mental energies is released from the tasks required for utility and mere survival. “Man is perfectly human,” said Schiller, “only when he plays.” And it is this awareness of an available surplus beyond the requirements of mere existence that his maxim conveys to us. Veblen spoke often of the intellectual faculty as “idle curiosity”—but this is a misnomer in so far as the curiosity of the playful mind is inordinately restless and active. This very restlessness and activity gives a distinctive cast to its view of truth and its discontent with dogmas.

 

Richard Hofstadter

 

The hypothesis has been proposed that all mental events and experiences, in fact the whole of the outer and inner sensory experiences, are a composite of elemental or unitary mental experiences at all levels of intensity. Each of these mental units is reciprocally linked in some unitary manner to a dendron ... Appropriately we name these proposed mental units 'psychons.' Psychons are not perceptual paths to experiences. They are the experiences in all their diversity and uniqueness. There could be millions of psychons each linked uniquely to the millions of dendrons. It is hypothesized that it is the very nature of psychons to link together in providing a unified experience.

 

John Carew Eccles

 

The professional man lives off ideas, not for them. ... He has acquired a stock of mental skills that are for sale. The skills are highly developed, but we do not think of him as being an intellectual if certain qualities are missing from his work—disinterested intelligence, generalizing power, free speculation, fresh observation, creative novelty, radical criticism. At home he may happen to be an intellectual, but at his job he is a hired mental technician who uses his mind for the pursuit of externally determined ends. It is this element—the fact that ends are set from some interest or vantage point outside the intellectual process itself—which characterizes both the zealot, who lives obsessively for a single idea, and the mental technician, whose mind is used not for free speculation but for a salable end. The goal here is external and not self-determined, whereas the intellectual life has a certain spontaneous character and inner determination. It has also a peculiar poise of its own, which I believe is established by a balance between two basic qualities in the intellectual’s attitude toward ideas—qualities that may be designated as playfulness and piety.

 

Richard Hofstadter