<P> On 8 September 1930, Hilbert elaborated his opinion in a celebrated address to the Society of German Scientists and Physicians, in Königsberg: </P> <Table> <Tr> <Td> "</Td> <Td> We must not believe those, who today, with philosophical bearing and deliberative tone, prophesy the fall of culture and accept the ignorabimus . For us there is no ignorabimus, and in my opinion none whatever in natural science . In opposition to the foolish ignorabimus our slogan shall be: Wir müssen wissen--wir werden wissen . (' We must know - we will know .') </Td> <Td>" </Td> </Tr> </Table> <Tr> <Td> "</Td> <Td> We must not believe those, who today, with philosophical bearing and deliberative tone, prophesy the fall of culture and accept the ignorabimus . For us there is no ignorabimus, and in my opinion none whatever in natural science . In opposition to the foolish ignorabimus our slogan shall be: Wir müssen wissen--wir werden wissen . (' We must know - we will know .') </Td> <Td>" </Td> </Tr> <P> Answers to some of Hilbert's Program of 23 problems were found during the 20th century . Some have been answered definitively; some have not yet been solved; a few have been shown to be impossible to answer with mathematical rigor . </P>

Wir müssen wissen. wir werden wissen. translation