Many Westerners forget that when the Prophet spoke of four wives as the maximum allowable number, he had in mind a reduction to four as compared to the number then often prevailing; moreover, Mohammed specified that a man should acquire more than one wife only if he could treat them all with equal justice - obviously a difficult feat for even the most diligent man to achieve. In effect, then, the Prophet curtailed the number of wives. - Mohammed Reza Pahlavi