An excellent book to help people find their motivation for mission within the Gospel opportunities around them. It's not about adding more to busy lives, but living our lives aware and open for God's work and ready to take up the invitation to be part of bringing blessing into others lives. I've seen a number of Christian lives transformed into the joy of their salvation away from the paralysing "I can't".
Be aware, it is simple, and repeats itself to build from chapter to chapter. Relax and take it as it is.