A fault once denied is twice committed.

The saying treats denial as more than a response to wrongdoing. When someone refuses to acknowledge a fault, that refusal is presented as a fresh moral failure added to the original act.

It urges candid admission and accountability: an error may be corrected or forgiven, but denying an evident wrong can deepen distrust and hinder repair. It should not be used to dismiss legitimate disagreement about facts or responsibility.

Use it when discussing responsibility after a mistake, especially where refusing to admit wrongdoing is seen as compounding the harm. It suits reflective or admonitory discussion rather than neutral description.