Written over half a century ago by two ladies, the "Two Listeners", who wished to remain anonymous, this has had proved one of the best selling devotional books of all time. With its companion volume, sales are well over 10 million copies worldwide. Those who have suffered pain and worry know how hard it is to write of serenity within. The message of comfort and hope that breathes through the pages of "God Calling" was forged out of adversity, and as a result has touched the hearts of millions.