Spurgeon's own experiences in the maze of life help others fight doubt. The book is not meant to be a formal argument but is given "to assist a friend." As the preface says: "How I have personally threaded the labyrinth of life thus far, may be of helpful interest to some other soul which just now is in a maze. I hope that by these pages some true heart may be assisted to 'fight his doubts and gather strength.'" The book contains 70 passages to help a person in times of doubt.