March 27, 1853, Albion, Michigan.
December 7, 1901, Cincinnati, Ohio, of typhoid fever.
Spring Grove Cemetery, Cincinnati, Ohio.
At age 17, Knapp began studies at a Methodist college in Albion, Michigan. He worked on the family farm in the summer, studying Greek and Latin at night, and attending classes in Albion in the winter.
In 1877, the Methodist Michigan Conference assigned him a circuit. He went on to a career in ministry, founding the magazine God’s Revivalist in 1888; the International Holiness Union and Prayer League in 1897; and God’s Bible School (later known as God’s Bible School and College) in Cincinnati, Ohio, in 1900. His works include:
- Christ Crowned Within, 1886
- The Double Cure
- Out of Egypt into Canaan, or Lessons in Spiritual Geography
- Diary Letters; A Missionary Trip Through the West Indies and to South America
- The River of Death and Its Branches
- Pentecostal Preachers
- Revival Kindlings, 1890
- Revival Tornadoes; or, Life and Labors of Rev. Joseph H. Weber (McDonald, Gill & Company, 1890)
- Impressions—How to Tell Whether They Are from Above or Below (Revivalist Publishing House; sixth edition, 1892)
- Tears and Triumphs, with Leander L. Pickett & John R. Bryant (Columbia, South Carolina: Leander L. Pickett, 1894)
- Lightning Bolts from Pentecostal Skies; or, Devices of the Devil Unmasked, 1898
- Holiness Triumphant, or, Pearls from Patmos, 1900
- Bible Songs of Salvation and Victory, with Robert McNeill (Cincinnati, Ohio: Martin W. Knapp, circa 1902)