Thomas Hobbes (1588 - 1679)

To understand this for sense it is not required that a man should be a geometrician or a logician, but that he should be mad.

["This" is that the volume generated by revolving the region under 1 / x from 1 to infinity has finite volume.]

Quoted in N Rose Mathematical Maxims and Minims (Raleigh N C 1988).