Some longer and shorter eternities

Georg Cantor...the celebrated mathematician who studied "infinity"...ended up in a mental institution arguing about similar questions !

Writing decades after Cantor's death, Wittgenstein lamented that mathematics is "ridden through and through with the pernicious idioms of set theory," which he dismissed as "utter nonsense" that is "laughable" and "wrong".[8] Cantor's recurring bouts of depression from 1884 to the end of his life were once blamed on the hostile attitude of many of his contemporaries,[9] but these episodes can now be seen as probable manifestations of a bipolar disorder.[10]
The harsh criticism has been matched by later accolades. In 1904, the Royal Society awarded Cantor its Sylvester Medal, the highest honor it can confer for work in mathematics.[11] Cantor believed his theory of transfinite numbers had been communicated to him by God.[12] David Hilbert defended it from its critics by famously declaring: "No one shall expel us from the Paradise that Cantor has created."[13]

Cantor's highly original views were vigorously opposed by his contemporaries, especially Kronecker. The attacks contributed to the nervous breakdowns he suffered throughout the final 33 years of his life. Cantor died in a mental institution.