TWO books by great evangelist Dwight L. Moody that go well together:
Book 1:
SECRET POWER
OR THE
SECRET OF SUCCESS IN CHRISTIAN
LIFE AND WORK
Instructions for tapping into the power of God to help Christians be victorious in all areas of their lives.
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Book 2:
THE OVERCOMING LIFE
AND OTHER SERMONS
Shows Christians how to overcome the problems, sin, and self which trouble many Christians.