There is no law by which righteousness may be obtained, not a single one.
 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 righteousness law
Date 1535
Language English
Reference
Note Translated by Theodore Graebner
Weblink http://www.gutenberg.org/files/1549/1549-h/1549-h.htm

Context

“To escape the charge of forgery they always have their convenient annotation handy, that Paul is referring only to the ceremonial and not to the moral law. But Paul includes all laws. He expressly says: "If there had been a law given." There is no law by which righteousness may be obtained, not a single one. Why not? VERSE 22. But the Scripture hath concluded all under sin. Where? First in the promises concerning Christ in Genesis 3:15 and in Genesis 22:18, which speak of the seed of the woman and the seed of Abraham.” source