By far the greater portion of the book is devoted to an urgent effort to persuade people to alter their ways and bring their lives into harmony with the will of God as set forth in its pages. No man is better for knowing that God in the beginning created the heavens and the earth. The devil knows that, and so did Ahab and Judas Iscariot. No man is better for knowing that God so loved the world of men that He gave His only begotten Son to die for their redemption. In hell there are millions that know that.
Theological truth is useless until it is obeyed.
The purpose behind all doctrine is to secure moral action. It addresses itself to the total man, and its obligations cannot be discharged by grasping it mentally. Truth engages the citadel of the human heart and is not satisfied until it has conquered everything there. The will must come forth and surrender its sword. It must stand at attention to receive orders, and those orders it must joyfully obey.