After my Bible, Becky S. Doughty's Life Letters will be the first tool in bag.
The letters are the author's imaginings of what MIGHT have been going through the character's mind.
Here's the blurb from Amazon.
Life Letters: The Fruit of The Spirit is a collection of letters personally penned by nine women from the Bible whose lives demonstrate what it means to produce the character traits of a believer; the "fruit" of the Spirit. Each letter focuses on one of the fruit listed in Galatians 5:22-23: love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self-control. Every letter concludes by taking the reader back to the Scriptures for a life-application study.