This book was published in 1928 and in 1931 as a new edition. The thrust of the book is the contrast between Catholicism (Christianity) and Judaism as noted by Church Law, history and precedent. In our age this distinction has been blurred or wiped out by the holocaust and the aftermath of World War II. The book is a needed corrective to present day errors relating to what the Church taught, what Catholics are obliged to understand and believe and to practice in a Christian society. It is written by Catholic Doctor of Theology Josef Alois Kofler to advise and help Catholics understand the issues and what is at stake. It was specifically written for the Catholic populace of Germany and Austria (both part of greater Germany of the Middle Ages), after the loss of World War I. It is supportive of national and ethnic German rebirth through the various Volkish (national ethnic) Associations that were working to overthrow the revolutionary Weimar Republic in Germany and the Austrian Republic in Austria and replace them with Catholic States. Dr. Kofler give much food for thought for our own days of ethnic and political strife and maps out a path to create a nation rather than a polyethnic union. He provides many thoughts for Catholics of our times on such subjects as proper marriage, abortion, the need for large families, etc.