Secret Power; or, The Secret of Success in Christian Life and Work by Dwight Lyman Moody

Dwight Lyman Moody (February 5, 1837 – December 22, 1899), also known as D.L. Moody, was an American evangelist and publisher connected with the Holiness Movement, who founded the Moody Church, Northfield School and Mount Hermon School in Massachusetts (now Northfield Mount Hermon School), the Moody Bible Institute, and Moody Publishers.