To work repentance is to mourn over past sins, and not to commit things to be mourned over. For he who weeps over some things so as yet to commit others, still knows not how to work repentance, or is a hypocrite; he must also reflect that by so doing he satisfies not his Creator, since he who had done what was forbidden, must cut off himself even from what is lawful, and so should blame himself in the least things who remembers that he has offended in the greatest.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: in Hom. 34. ut sup.