1,200 years before Descartes said his famous thing about "I think therefore I am," this guy, St. Augustine, sat down and wrote "Fallor ergo sum" -- "I err therefore I am."
1200 anos antes Descartes dizer a famosa frase 'Penso, logo existo', Santo Agostinho, sentou-se e escreveu: "Fallor ergo sum" Erro, logo existo.