Praying the Mass: The Prayers of the People

What does "God from God, Light from Light, True God from True God" mean? Why is "And also with you" being changed to "And with your spirit"? Where does "I am not worthy that you should enter under my roof" come from?The new English translation of the Roman Missal is a cause for great joy among English-speaking Catholics, but it can also be a source of confusion if the changes it introduces are not adequately explained. Praying the Mass provides a mystagogical catechesis on the new Mass tran...