What is intelligence? Without rising to the heights of the definitions given by the philosophers, we may, for the moment, consider the sum of those reflex and associative or reproductive activities which enable the mind to construct itself, putting it into relation with the environment. According to Bain, the consciousness of difference is the beginning of every intellectual exercise; the first step of the mind is appreciation of "distinction." The bases of its perceptive functions towards the external world are the "sensations." To collect facts and distinguish between them is the initial process in intellectual construction.
Let us try to infuse a little more precision and clarity into the analysis of intelligence.
The first characteristic which presents itself to us as an indication of intellectual development is related to time. The masses are so much alive to this primitive characteristic, that the popular expression "quick" is synonymous with intelligent. To be rapid in reacting to a stimulus, in the association of ideas, in the capacity of formulating a judgment—this is the most obvious external manifestation of intelligence. This "quickness" is certainly related to the capacity for receiving impressions from the environment, elaborating images, and externalizing the internal results. All these activities may be developed by means of an exercise comparable to a system of mental "gymnastics" to collect numerous sensations, to put them constantly in relation one with another, to deduce judgments therefrom, to acquire the habit of manifesting these freely, all this ought, as the psychologists would say, to render the conductive channels and the associative channels more and more permeable, and the "period of reaction" ever briefer. As in intelligent muscular movement, the repetition of the act not only renders it more perfect in itself, but more rapid in execution. An intelligent child at school is not only one who understands, but one who understands quickly. On the other hand, one who learns the same things, but who takes a longer time in so doing, say two years instead of one, is slow. Of a "quick" child, the people say that "nothing escapes him"; his attention is always on the alert, and he is ready to receive every kind of stimulus: as a sensitive scale will show the slightest variation in weight, so the sensitive brain will respond to the slightest appeal. It is Equally rapid in its associative processes: "He understands in a flash" is a familiar saying to indicate accurate conception.
Now an exercise which "puts in motion" the intellectual mechanisms can only be an "auto-exercise." It is impossible that another person, exercising himself in our stead, should make us acquire skill.
The sensory exercises arouse and intensify the central activities in our children. When, sense and stimulus duly isolated, the child has clear perceptions in his consciousness; when sensations of heat, cold, roughness, smoothness, weight, and lightness, when a sound, an isolated noise, are perceived by him, when, in almost complete silence, he closes his eyes and waits for a voice to murmur a word, it is as if the external world had knocked at the door of his soul, awakening its activities. And further, when the multitudinous sensations are all contained in the richness of the environment, the two react harmoniously one upon the other, intensifying the activities that have been awakened: this is exemplified in the case of the child absorbed in coloring his designs, who will choose the most beautiful tints while music is being played, or in that of another who, contemplating the gay and gracious environment of the school and the flowering plants, will sing his song to perfection.
The first characteristic which manifests itself in our children, after their process of auto-education has been initiated, is that their reactions become ever more ready and more rapid: a sensory stimulus which might before have passed unobserved or might have roused a languid interest, is vividly perceived. The relation between things is easily recognized, and thus errors in their use are quickly detected, judged, and corrected. By means of the sensory gymnastics the child carries out just this primordial and fundamental exercise of the intelligence, which awakens and sets in motion the central nervous mechanisms.
When we see these external manifestations of our quick and active children—sensitive to the slightest call, ready to run swiftly towards us without relaxing the attention they give to their own movements and to all the external objects they encounter—and compare them with the torpid children in the ordinary schools—clumsy in their movements, indifferent to stimuli, incapable of spontaneous association of ideas—we are led to think of the civilization of our own days as compared with that of olden times. The civil environment of bygone years, as compared with our own, was more leisurely: we have learnt how to save time. The stage-coach was once the means of transport, whereas now we travel in motor-cars and even in aeroplanes; the voice was the medium of speech from a distance, whereas now we speak through the telephone; men killed each other one by one, whereas now they kill each other en masse. All this makes us realize that our civilization is not based upon "respect for life" and "respect for the soul," but rather is it based upon "respect for time." It is solely in an external sense that civilization has pursued its course. It has become more rapid, it has set in motion machinery.
But man has not had the same preparation to keep up with it: individuals have not accelerated themselves methodically; the children of this bewildering environment are not new men, more active, readier, more intelligent. The transformed human personality has not yet arisen ready to meet all eventualities and to utilize for his own benefit the external conquests of his environment. Torpid man saves time and money in this civilization; but his soul remains defrauded and oppressed.