Francois Pierre Guillaume Guizot (1787-1874) was a French historian, orator, and statesman. Guizot is famous for saying "Not to be a republican at 20 is proof of want of heart; to be one at 30 is proof of want of head" Это и многое другое вы найдете в книге History of the English Revolution of 1640 (F. Guizot)