When we believe in the Law we may be active enough but we have no life. The function of the Law is not to give life
 Martin Luther, Commentary on the Epistle to the Galatians (1535). copy citation

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Author Martin Luther
Source Commentary on the Epistle to the Galatians
Topic law life
Date 1535
Language English
Reference
Note Translated by Theodore Graebner
Weblink http://www.gutenberg.org/files/1549/1549-h/1549-h.htm

Context

“Indeed, works do follow after faith, but faith is not therefore a meritorious work. Faith is a gift. The character and limitations of the Law must be rigidly maintained. When we believe in Christ we live by faith. When we believe in the Law we may be active enough but we have no life. The function of the Law is not to give life; the function of the Law is to kill. True, the Law says: "The man that doeth them shall live in them." But where is the person who can do "them," i.e., love God with all his heart, soul, and mind, and his neighbor as himself?” source