Final answer:
The specific statement from Cicero about what he won't mention is not provided in the excerpts, but his writings often engage with moral and sensitive subjects.
Step-by-step explanation:
From the various excerpts provided, Cicero mentions regrettable actions or accusations on various occasions, but what he specifically states he won't mention is not contained within the given text.
However, we can infer that Cicero, known for his oratory and rhetorical skills, often mentioned things implicitly or explicitly that could be embarrassing or of a sensitive nature.
These could range from morally questionable behaviors of others, such as the accusations of murder in the letter to his brother, to the less than exemplary behaviors attributed to public figures like Antony.
Cicero's reflections on personal shame and his discussions of virtue and disgrace in the given texts illustrate his deep engagement with the moral and social standards of his time.