We live in the era of the specialization of knowledge, thanks to the prodigious development of science and technology and to the consequent fragmentation of knowledge into innumerable parcels and compartments. This cultural trend is, if anything, likely to be accentuated in years to come. To be sure, specialization brings many benefits. It allows for deeper exploration and greater experimentation; it is the very engine of progress. Yet it also has negative consequences, for it eliminates those common intellectual and cultural traits that permit men and women to co-exist, to communicate, to feel a sense of solidarity. Specialization leads to a lack of social understanding, to the division of human beings into ghettos of technicians and specialists. The specialization of knowledge requires specialized languages and increasingly arcane codes, as information becomes more and more specific and compartmentalized. This is the particularism and division against which an old proverb warned us: do not focus too much on the branch or the leaf, lest you forget that they are part of a tree, or too much on the tree, lest you forget that it is part of a forest. Awareness of the existence of the forest creates the feeling of generality, the feeling of belonging, that binds society together and prevents it from disintegrating into a myriad of solipsistic particularities. The solipsism of nations and individuals produces paranoia and delirium, distortions of reality that generate hatred, wars, and even genocide.