Rudolf Otto 
The Kingdom of God and the Son of Man [PDF ebook] 
A Study in the History of Religion

This work, originally published in German as Reichgottes und Menschensohn, created an even greater impression, and has had to be reckoned with in all subsequent studies of the person and work of Jesus Christ, particularly from the point of view of his “Messianic self-consciousness“. The first English translation was published in 1938 and the present volume is a reprint of the substantially revised edition of 1943. Translated by Floyd Filson and Bertram Lee-Wolff.