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."
1.200 tahun sebelum Descartes mengatakan prinsipnya yang terkenal mengenai "saya berpikir maka saya ada," orang ini, Santo Agustinus, duduk dan menulis "Fallor ergo sum" -- "Saya melakukan kesalahan, karena itu saya ada."