The listing, Nine Fruits of the Spirit Devotion Series by Robert Strand has ended.
This is a Bible Study on developing the Christian character. Each of these little books covers one of the fruits of the spirit. Unfortunately, I could only find 8 of the 9. Each stands alone, though. They are all brand new. Each has about six devotions with questions and room for you to write your answers. There is a summary at the end of each. Scriptures are used to back up his teaching. This would be a good set to work on alone or with a friend.