Through language, the child is initiated into the wealth of human culture. Whereas with other animals, the factor of genetic inheritance is predominant, in human society, the cultural factor is decisive. The human infant has to go through a very long period of “apprenticeship” in which it is completely subordinated to adults, particularly its parents, who, largely by means of language, initiate it into the mysteries of life, society and the world. The child finds itself confronted with a ready-made model to copy and imitate. Later this is expanded to include other adults and children, especially through play. This process of socialisation is not easy or automatic, but it is the basis of all intellectual and moral development. All parents have noticed with amusement how small children will withdraw into a world of their own, and quite happily conduct a “conversation” with themselves for long periods, while playing on their own. The development of the child is intimately linked to the process of breaking away from this primitive state of egocentricity, and relating to others and to external reality in general.

In Piaget’s original scheme, the period from two to seven years marks the transition from the simply “practical” (“sensorimotor”) phase of the intelligence, to thought as such. This process is characterised by all kinds of transitional forms between the two. It reveals itself in play, for example. From seven to twelve, games appear with rules, implying common objectives, as opposed to playing with dolls, say, which is highly individual. The logic of primary infancy can be described as intuition, which is still present in adults – what Hegel calls “immediate” thought. At a later stage, well known to parents, the child begins to ask why? This naïve curiosity is the beginning of rational thinking – the child is no longer willing just to take things as they are, but seeks a rational ground for them. It grasps the fact that all things have a cause, and tries to grasp what this is. It is not satisfied with the mere fact that “B” happens to occur after “A”. It wishes to know why it has occurred. Here too the child of between three to seven years of age shows itself to be wiser than some modern philosophers.

Intuition, to which a certain aura of magic and poetry has been traditionally attached, is, in fact, the lowest form of thinking, characteristic of very small children and people on a low level of cultural development. It consists of the immediate impressions provided by the senses, which provoke us to react “spontaneously”, that is, in an unthinking way, to a given circumstance. The rigours of logic and consistent thought do not enter into it. Such intuitions can sometimes be spectacularly successful. In such cases, the apparently spontaneous nature of the “flash of inspiration” provides the illusion of a mysterious insight coming “from within” and divinely inspired. In fact, intuition comes, not from the obscure depths of the soul, but from the interiorisation of experience, which is obtained, not in a scientific way, but in the form of images and the like.

A person with considerable experience of life can frequently arrive at an accurate assessment of a complicated situation on the basis of the scantiest information. Similarly, a hunter can display almost a “sixth sense” about the animals he is tracking. In the case of truly great minds, flashes of inspiration are considered to represent a quality of genius. In all these cases, what appears to be a spontaneous idea is, in fact, the distilled essence of years of experience and reflection. More often, however, mere intuition leads to a highly unsatisfactory, superficial and distorted form of knowledge. In the case of children, “intuition” marks the primitive, immature phase of thought, before they are able to reason, define and judge. It is so inadequate that it is generally regarded as comical by adults, who have long since left this phase behind. In all these cases, it goes without saying that there is nothing mystical involved.

In the first stages of life, the child does not distinguish between itself and its physical environment. Only gradually, as we have seen, does the child begin to distinguish between the subject (“I”) and the object (the physical world). It begins to understand the real relationship between its environment and itself in practice, through manipulation of objects and other physical operations. The primitive unity is broken down, and a confusing multiplicity of sights, sounds and objects emerges. Only later does the child begin to grasp the connections between things. Experiments have shown that the child is consistently more advanced in deeds than in words.

There is no such thing as a “purely intellectual act”. This is particularly clear in the case of small children. It is commonplace to counterpose the heart and the head. This, too, is a false opposition. The emotions play a part in the solution of intellectual problems. Scientists become excited over the solution of the most abstruse equations. Different schools of thought clash heatedly over problems of philosophy, art, and so on. On the other hand, there is no such thing as pure acts of affection. Love, for example, presupposes a high degree of understanding between two people. Both the intellect and the emotions play a role. The one presupposes the other, and they intervene and condition each other, to a greater or lesser degree.

As the degree of socialisation advances and develops, the child becomes more aware of the need for what Piaget calls “inter-personal sentiments” – the emotional relations between people. Here we see that the social bond itself involves contradictory elements of attraction and repulsion. The child learns this first in relation to its parents and family, and then forms close bonds with broader social groups. Feelings of sympathy and antipathy are developed, linked to the socialisation of actions, and the appearance of moral sentiments – good and bad, right and wrong, which mean much more than “I like” or “I dislike”. They are not subjective but objective criteria derived from society.

These powerful bonds are an important part of the evolution of human society, which, from the outset was based on co-operative social production and mutual dependence. Without this, humanity would have never emerged from the animal world. Morality and tradition are learned through language, and passed on from generation to generation. Compared to this, the factor of biological inheritance appears quite secondary, although it remains the raw material from which humanity is constructed.

With the commencement of proper schooling, from about the age of seven, the child begins to develop a strong sense of socialisation and co-operation. This is shown in games with rules – even a game of marbles requires a knowledge and acceptance of quite complicated rules. Like the rules of ethics and the laws of society, they must be accepted by all, in order to be viable. A knowledge of rules and how they are to be applied goes together with a grasp of something as complicated as the grammatical and syntactical structure of language.

Piaget makes the important observation that “all human behaviour is at the same time social and individual.” Here we have a most important example of the unity of opposites. It is entirely false to counterpose thought to being, or individual to society. They are inseparable. In the relationship between subject and object, between the individual and the environment (society) the mediating factor is human practical activity (labour). The communication of thought is language (exteriorised reflection). On the other hand, thought itself is interiorised social intercourse. At seven years of age, the child begins to understand logic, which consists precisely of a system of relations, permitting the coordination of points of view.

In a brilliant passage, Piaget compares this stage with the early stage of Greek philosophy, when the Ionian materialists parted company with mythology, in order to arrive at a rational understanding of the world:

It is surprising to observe that, among the firsts (new forms of explanation of the uniters) to appear, there are some which present a notable similarity to that given by the Greeks precisely in the epoch of decline of mythological explanations, properly so-called.

Here we see, in a very striking way, how the forms of thought of each individual child in its early development, provides a rough parallel to the development of human thought in general. In the early stages, there are parallels with primitive animism, where the child thinks that the sun shines, because it was born. Later the child imagines that clouds come from smoke, or air; stones are made of earth, etc. This recalls the early attempts to explain the nature of matter in terms of water, air, and so on. The great significance of this is that it was a naïve attempt to explain the universe in materialist, scientific terms, rather than in terms of religion and magic. The child of seven begins to grasp the notion of time, space, speed, etc. However, this takes time. Contrary to Kant’s theory that the notion of time and space are inborn, the child cannot grasp such abstract ideas until they are experimentally demonstrated. Thus, idealism is shown to be false by a study of the processes of developing of human thought itself.