From the Quotation of the day mailing list, 2008-01-14:
"Treason is a matter of dates." -- Talleyrand (Charles-Maurice de Talleyrand-Perigord (1754-1838))
(submitted to the mailing list by Terry Labach)
(I was thinking of this cartoon from a New York Times op-ed for Canada Day a few days ago, when I picked today's quote. I'm aware that Talleyrand had something a bit different in mind.)