The second reading for Catholic weddings and at most Sunday Masses comes from the New Testament, specifically the letters of the first apostles to the early Christian communities. Many of these letters trace back to the writings of Paul, while others to Peter and John. Most of the second reading choices assigned for use during Catholic weddings focus on the theme of love and most of them were originally written not for married couples, but as letters to the Christian communities of the first century. These letters from early Church leaders reminded ancient Christians how to live in peace and harmony with one another and were often attempts at resolving disputes. Married members of these early communities are called upon to model for the rest what Christian relationships should look like.