“Do not try the parallels in that way: I know that way all along. I have measured that bottomless night, and all the light and all the joy of my life went out there.”

Letter to János Bolyai (4 April 1820)
Published in: Samu Benkő (ed.), Bólyai-levelek, Kriterion, 1975, p. 123
As quoted in: O'Connor, John J.; Robertson, Edmund F., "Farkas Bolyai" http://www-groups.dcs.st-and.ac.uk/history/Biographies/Bolyai_Farkas.html, MacTutor History of Mathematics archive, University of St Andrews.
Having himself spent a lifetime unsuccessfully trying to prove Euclid's fifth postulate, Farkas discouraged his son János from any further attempt.

Original

A parallelákat azon az útan ne próbáld: tudom én azt az utat is mind végig — megmértem azt a feneketlen éjszakát én, és az életemnek minden világossága, minden öröme kialudt benne...

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Hungarian mathematician 1775–1856

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