thomas a kempis

The Founders of the New Devotion: Being the Lives of Gerard Groote, Florentius Radewin and Their Followers.
Lives of Gerard Groote and the brethren whose quiet movement of renewal shaped the Imitation itself.
The Imitation of Christ
Four books of counsel on humility, inward peace, and the following of Christ; among the most read books ever written.

Thomas a Kempis

The likely author of The Imitation of Christ, a quiet book that has outlived nearly every other.