If a man serve not God only, then surely he serves the devil; because no man can serve God, unless he have his Word and command.
 Martin Luther, Table Talk (1566). copy citation

add
Author Martin Luther
Source Table Talk
Topic God words
Date 1566
Language English
Reference
Note Translated by William Hazlitt
Weblink http://www.ntslibrary.com/PDF%20Books/Luther%20Table%20Talk.pdf

Context

“If what this Psalm says be true, then are the allegations and aims of the papists stark lies and folly. If I were as our Lord God, and had committed the government to my son, as he to his Son, and these vile people were as disobedient as they now be, I would knock the world in pieces. CXII. If a man serve not God only, then surely he serves the devil; because no man can serve God, unless he have his Word and command. Therefore, if his Word and command be not in thy heart, thou servest not God, but thine own will; for that is upright serving of God, when a man does that which in his Word God has commanded to be done, every one in his vocation, not that which he thinks good of his own judgment.” source