Books that have been important to me
The Bible, of course -- I particularly like The Message and J.B. Phillips. I use the Common English Bible primarily in sermons, although I love the sound of the King James Version (and when I think of a Bible verse, it is almost from the KJV).
One of the first books that made an impact on me in terms of affecting attitudes/behavior was Stop! You're Driving Me Crazy by George R. Bach and Ronald M. Deutsch. It made me realize that it is my attitude about something happening in my life that is driving me crazy, not the actual happening, and that I can control my attitude and what I do. It really was the first time I realized that it was up to me what I thought and did. I was probably in my 30s when I read this book. I know -- slow learner. But at least I did finally learn.
The next book was Just Enough Light for the Step I'm On by Stormie Omartian. I had long thought that God had a plan for my life and I was always searching to find out what the plan was. But I also thought I ought to be able to see the path ahead. Stormie's book made me see that I don't get to see a mile ahead -- I get just enough light for the step I'm on, and that's all I need to walk by faith.
If You Want to Walk on Water, You've Got to Get Out of the Boat by John Ortberg was the next important book. Faith isn't enough -- you've got to get out of the boat; you've got to have the courage and the will to take action.
Most recently, I read Crash the Chatterbox: Hearing God's Voice Above All Others by Steven Furtick. This book talks about the voice in our heads that tells us that we're not worthy, that we're stupid or never do things right, etc., and Furtick gives tips for using Scripture to counteract those negative words.
Other favorite books
Little Women by Louisa May Alcott (I probably read that every year throughout my teenage years).
Everything by Grace Livingston Hill, Emile Loring, Agatha Christie, and Erle Stanley Gardner. Literally. I read every book those four authors wrote.