In French: Ils n'ont rien appris, ni rien oublié. There is no historic evidence linking the saying to Talleyrand. It may derive from a similar lamentation about the royalists, found in a letter by Charles Louis Etienne, chevalier de Panat, a French naval officer, dated January 1796 and sent from London to Mallet du Pan: personne n'a su ni rien oublier, ni rien apprendre ("nobody has been able to forget anything, nor to learn anything"), included in: A. Sayou, ed. (1852). Mémoires et correspondance de Mallet du Pan. Vol. II. p. 197.
The Governor General of Canada (12 November 2020). "Royal Banner of France – Heritage Emblem". Confirmation of the blazon of a Flag. February 15, 2008 Vol. V, p. 202. The Office of the Secretary to the Governor General.
