If an age is imbued with an error, some always derive advantage from the error, while the rest have to suffer from it. In the Middle Ages the error was general among Christians that the church must have all power, or the supreme lordship on earth; the hierarchs believed in this "truth" not less than the laymen, and both were spellbound in the like error. But by it the hierarchs had the advantage of power, the laymen had to suffer subjection. However, as the saying goes, "one learns wisdom by suffering"; and so the laymen at last learned wisdom and no longer believed in the medieval "truth."