The second letter of Paul to the Corinthians is probably the least known of all his letters. It has sometimes been called "Paul's unknown letter." I do not know why that is. First Corinthians is very well-known among his writings, but many people feel that Second Corinthians is heavy reading. It is too bad that we are so unfamiliar with it, because it represents the most personal, the most autobiographical letter from the apostle's pen.