This is a powerful book which has helped me get out of my comfort zone to share Christ with others. It is convicting, equipping and inspiring. Great material for a small group study...you can get a study guide for One Thing at markcahill.org. Cahill has a great love for the lost. He conference-called our small group for 45 minutes one evening when we were going through One Thing. Consider buying copies of One Thing and passing them out. I've done this in a local jail, to folks in Mexico and Canada and people get fired up to share the Gospel. You can impact eternity for Christ in many ways through reading and sharing this book. Time is short, you may not have tomorrow so what are you waiting for? What are you willing to do to hear "Well done good and faithful servant"?
This book is a good motivational tool for personal evangelism. While the author gives some pointers on apologetics, the theme is getting to the task of sharing the Gospel with people all around us. His earnest, heartfelt desire to take Jesus to other people is very refreshing.
Excellent book, as everyone has already said. Important to also know it's very quick and easy reading. On top of being so important and relevant, it's actually entertaining! I am ordering copies for all the ladies in my small group for Christmas!