The 16th-century Jewish theologian Isaac ben Abraham, who lived in Trakai, Lithuania, penned a work called "Chizzuk Emunah" ("Faith Strengthened") that attempted to refute the ideas that Jesus was the Messiah prophesied in the Old Testament and that Christianity was the "New Covenant" of God. He systematically identified a number of inconsistencies in the New Testament, contradictions between the New Testament and the Old Testament, and Old Testament prophesies which remained unfulfilled in Jesus' lifetime. In addition, he questioned a number of Christian practices, such as Sunday Sabbath. Written originally for Jews to persuade them not to convert to Christianity, the work was eventually read by Christians. While the well-known Christian Hebraist Johann Christoph Wagenseil attempted an elaborate refutation of Abraham's arguments, Wagenseil's Latin translation of it only increased interest in the work and inspired later Christian freethinkers. "Chizzuk Emunah" was praised as a masterpiece by Voltaire.