"The importance of the subject of this book is beyond estimation. True spirituality is that quality of life in the child of God which satisfies and glorifies the Father. The divine way to sufficiency and efficiency must be understood and acted upon, else we fail. The object [of this book] has been to state the outstanding revelation of the divine provisions for the overcoming life. May we be delivered from controversey over secondary things in the face of our present failure to 'walk as it becometh saints.' It is my prayer that this statement of the fact and force of the spiritual life may be helpful to those who are called upon to manifest Christ to a dying world, and who hope to hear the Master say, 'Well done.'" (Lewis Sperry Chafer, preface, 1918)