"I do not know whether my enemies will reply to me, or adopt the role of silence. Whatever they may do I declare to them that this letter will be my only reply to all their calumnies, past, present or future; and I give my word of honor to the public that whatsoever they may say or do, I shall not write a single line more in my justification. (Postscriptum)"
January 1, 1970
https://en.wikiquote.org/wiki/Alessandro_Cagliostro