Some of his maxims are extremely interesting in the light of modern notions on the same subjects. He declared emphatically that "the most important duty of the physician is to prevent illness." "Most patients get better without much help from the physician by the power of nature." He emphasized his distrust of using many medicines at the same time in the hope that some of them would do good. He laid it down as a rule: "Employ only one medicine at a time in all your cases and note its effects carefully." He was as wise with regard to medical ethics as therapeutics. He advised a young physician, "Never speak unfavorably of other physicians. Every one of us has his lucky and unlucky hours." It is pleasant to learn that the old gentleman lived to fill out a full hundred years of life, and that in his declining years he was surrounded by the good will and the affection of many who had learned to know his precious qualities of heart and mind. More than of any other class of physicians do we find the large human sympathies of the Jewish physicians of the Middle Ages praised by their contemporaries and succeeding generations. During the next centuries a number of Jewish physicians became prominent, though none of them until Maimonides impressed themselves deeply upon the medical life of their own and succeeding centuries. Very frequently they were the physicians to royal personages. Zedkias, for instance, was the physician to Louis the Pious and later to his son Charles the Bald. His reputation as a physician was great enough to give him the popular estimation of a magician, but it did not save him from the accusation of having poisoned Charles when that monarch died suddenly. There seem to be no good grounds, however, for the accusation. There were a number of schools of medicine, in Sicily and the southern part of Italy, in which Jewish, Arabian, and Christian physicians taught side by side. One of these teachers was Jude Sabatai Ben Abraham, usually known by the name of Donolo, who was famous both as a writer on medicine and on astronomy. Donolo studied and probably taught at Tarentum, and there were similar schools at Palermo, at Bari, and then later on the mainland at Salerno. The foundation of Salerno, in which Jewish physicians also took part, we shall discuss later in the special chapter devoted to that subject.