Janusz Janowiak O.carm was born in Lipnica Wielka, Poland, in 1974. He obtained his Doctorate in Biblical Theology from the Milltown Institute of Theology and Philosophy in Dublin, Ireland. He is a lecturer in Biblical Theology and Koine Greek at the St. Jozef Bilczewski Theological Institute in Lviv, Ukraine, and has published several articles on the authorship and origin of various biblical books. This engaging study offers unique insights into the difficult and sometimes controversial theme of God’s zeal and jealousy as taught in the Old Testament. Making use of the historical-critical method, the author presents the texts examined in this book against their historical background to reflect their development and conducts their exegetical and theological analysis. In this way, he demonstrates that this concept predominantly speaks of God who loves his people so much that he wants them to remain faithful to him and inspires them to give a positive response to his love.