english: 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."
non_english: 1.200 jaar vóór Descartes zijn beroemde uitspraak "Ik denk dus ik ben" deed schreef Sint Augustinus "Fallor ergo sum" - "Ik dwaal dus ik ben."