Logic is the mirror of thought, and not vice versa;in classes, relations et nombres; essai sur les groupements de logistique et la réversibilitié de … - Jean Piaget

The need to speak the truth and even to seek it for oneself is only conceivable in so far as the individual thinks and acts as one of a society, and not of any society (for it is just the constraining relations between superior and inferior that often drive the latter to prevarication) but of a society founded on reciprocity and mutual respect, and therefore on cooperation.

for example, to see whether in the developing subject, i.e. the child, integers are directly constructed starting from class logic by biunivocal correspondence and the construction of a “class of equivalent classes” as Frege and B. Russell thought, or whether the construction is more complex and presupposes the concept of order.

The relations between parents and children are certainly not only those of constraint. There is spontaneous mutual affection, which from the first prompts the child to acts of generosity and even of self-sacrifice, to very touching demonstrations which are in no way prescribed. And here no doubt is the starting point for that morality of good which we shall see developing alongside of the morality of right or duty, and which in some persons completely replaces it.