How were the summarized books selected?

We searched for well-respected voices that spoke wisely on Christian unity. In doing so, we intentionally chose books representative of the major periods in church history—early, medieval, Reformation, post-Reformation, and modern—for unity is a topic of concern for believers in all ages. The importance of Christian love and the problem of Christian conflict are not limited to any particular period, place, or denomination. The Biblical solutions offered to promote Christian love and resolve Christian conflict are not limited either. We believe that the thousands of hours spent researching, updating, and summarizing these works for the benefit of the body of Christ will prove to be worthwhile.