This paper is devoted to the analysis and to the comparison of concepts on theodicy and on the nature of evil that was developed by two medieval Jewish philosophers. They are Levi ben Gershom (Gersonides or Ralbag, 1288-1344) and Hasdai Crescas (1340-1410/12). The sources of the analysis are the third chapter of the fourth book of the “Wars of the Lord” (1329) by Gersonides and the second chapter of the second book of the “Light of the Lord” (1410) by Crescas. Both philosophers assert that evil essentially cannot come from God. The causes of evil are the sinfulness of human beings, or the celestial bodies, or the breaking of the connection between human and God. The problem of evil and injustice in this world are closely related for Gersonides and Crescas to other problems, such as divine knowledge of future events, free will, reasons for reward and punishment. Gersonides and Crescas differ considerably on these issues. Gersonides demonstrates that God is not an essential source of evil. He proceeded to build on this statement with the fallacy of the opinion that divine providence extends to individuals. After all, said Gersonides, retribution would make God a source of evil. And in this case, righteous men would always be rewarded, and sinners would always be punished for their sins. But obviously this is not the case. Crescas, in contrast to Gersonides, claims that God knows individuals. This does not prevent him from agreeing with Ralbagh that God is not the source of evil. According to Crescas, any punishment or suffering (even for the righteous) always leads to good. It is obvious therefore that Crescas adheres to a more traditional position, trying, inter alia, to bring his thoughts as close as possible to the ideas expressed in the Torah. Gersonides adheres to a position close to the ideas of Maimonides. Gersonides, in the author’s opinion, created a philosophical concept that is more consistent in comparison with Crescas’ conception, however more distant from the Jewish teaching.
