The set of 10 titles, written by Gordon Lindsay, aims at effective discipleship. 64 million copies of this 10-title set have been greatly used by God in 120 countries in up to 83 languages. They have been smuggled into controlled countries and read at the risk of people’s lives. An untold number of Bible Training institutions use them as textbooks. The list goes on about how they are instrumental in the spiritual growth of myriads of people.