True, the consciousness of work well done cannot quiet the conscience.
 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 consciousness conscience
Date 1535
Language English
Reference
Note Translated by Theodore Graebner
Weblink http://www.gutenberg.org/files/1549/1549-h/1549-h.htm

Context

“Before the judgment throne of Christ everybody will have to bear his own burden. As it is the praise of men stops when we die. Before the eternal Judge it is not praise that counts but your own conscience. True, the consciousness of work well done cannot quiet the conscience. But it is well to have the testimony of a good conscience in the last judgment that we have performed our duty faithfully in accordance with God's will. For the suppression of pride we need the strength of prayer.” source