There is treasure hidden in Paul's thirteen letters, but the path to find it is not obvious. In the Bible Paul's letters are not sequenced in chronological order. Paul wrote his letters within the two decades of A.D. 48 to A.D. 68. His thirteen generally accepted letters are arranged in the New Testament in two blocks: the nine written to churches, then the four written to individuals. The nine written to churches are generally placed in order by length.