In tribal times, there were the medicine men. In the Middle Ages, there were the priests. Today, there are the lawyers. For every age, a group of bright boys, learned in their trades and jealous of their learning, who blend technical competence with plain and fancy hocus-pocus to make themselves masters of their fellow men. For every age, a pseudo-intellectual autocracy, guarding the tricks of the trade from the uninitiated, and running, after its own pattern, the civilization of its day.
Every act of conscious learning requires the willingness to suffer an injury to one's self-esteem. That is why young children, before they are aware of their own self-importance, learn so easily.