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.