Of a hot-blooded nature, an enthusiast whose imagination overpowered his judgment, Uriel da Costa had formed for himself an ideal of Judaism which he expected to meet with in Amsterdam, but which had never been realized. He thought to see biblical conditions, supported by pure Pentateuchal laws, realized in the young Amsterdam community, and to find an elevation of mind which would at once clear up the puzzles that the Catholic Church could not solve. What the Catholic confessors could not offer, he thought that he would be able to obtain from the rabbis of Amsterdam. Da Costa had built religious and dogmatic castles in the air, and was annoyed not to meet with them in the world of reality. He soon found that the religious life of the Amsterdam community and its established laws did not agree with Mosaic or Pentateuchal precepts, but were often opposed to them. As he had made great sacrifices for his convictions, he thought that he had the right to express his opinion freely, and point to the gap which existed between biblical and Rabbinical Judaism. He was deeply wounded, embittered, and irritated, and allowed himself to be completely overpowered by his feelings. He did not stop at mere words, but regulated his conduct accordingly, openly disregarded religious usages, and thought that in opposing the ordinances of the "Pharisees" (as, in the language of the Church, he called the rabbis), he was recommending himself to the favor of God. He thereby brought upon himself unpleasantnesses destined to end tragically. Were the Amsterdam Jews, who had suffered so much for their religion, quietly to see one of their members openly assail and ridicule Judaism, become so dear to them? Those born and brought up in the land of the Inquisition had no idea of toleration and indulgence for the conviction of others. The rabbis, perhaps Isaac Uziel and Joseph Pardo, threatened Da Costa with excommunication, _i. e._, expulsion from the religious community and severance of all relations with it, if he persisted in transgressing the religious ordinances of Judaism. This opposition only served to increase Da Costa's passion; he was ill-content to have purchased new fetters by the sacrifices he had made. He continued to disregard the laws in force, and was eventually excommunicated. Uriel's relatives, who had more easily adapted themselves to the new faith, avoided him, and spoke not a word to him. Thus Da Costa stood alone in the midst of a great city. Separated from his race, friends, and relatives, a stranger amongst the Christian inhabitants of Amsterdam, whose language he had not yet learnt, and thrown upon himself, he fell more and more into subtle speculation. Acting under excessive irritation, he resolved to publish a work hostile to the Judaism of the day, and bring out particularly the glaring contrast between it and the Bible. As irrefragable proof, he intended to emphasize that the former recognized only bodily