It cannot be denied that the system of repression pursued in Spain, with respect to the Jews and the Moors, was inspired, in great measure, by the instinct of self-preservation: we can easily believe that the Catholic princes had this motive before them when they decided on asking for the establishment of the Inquisition in their dominions. The danger was not imaginary; it was perfectly real. In order to form an idea of the turn which things might have taken if some precaution had not been adopted, it is enough to recollect the insurrections of the last Moors in later times.
Yet it would be wrong, in this affair, to attribute all to the policy of royalty; and it is necessary here to avoid exalting too much the foresight and designs of men; for my part, I am inclined to think that Ferdinand and Isabella naturally followed the generality of the nation, in whose eyes the Jews were odious when they persevered in their creed, and suspected when they embraced the Christian religion. Two causes contributed to this hatred and animadversion: first, the excited state of religious feeling then general in all Europe, and especially in Spain; second, the conduct by which the Jews had drawn upon themselves the public indignation.
The necessity of restraining the cupidity of the Jews, for the sake of the independence of the Christians, was of ancient date in Spain: the old assemblies of Toledo had attempted it. In the following centuries the evil reached its height; a great part of the riches of the peninsula had passed into the hands of the Jews, and almost all the Christians found themselves their debtors. Thence the hatred of the people against the Jews; thence the frequent troubles which agitated some towns of the peninsula; thence the tumults which more than once were fatal to the Jews, and in which their blood flowed in abundance. It was difficult for a people accustomed for ages to set themselves free by force of arms to resign themselves peacefully and tranquilly to the lot prepared for them by the artifices and exactions of a strange race, whose name, moreover, bore the recollection of a terrible malediction.