Thomas Nagel Quote
Reason is universal because no attempted challenge to its results can avoid appealing to reason in the end-by claiming, for example, that what was presented as an argument is really a rationalization. This can undermine our confidence in the original method or practice only by giving us reasons to believe something else, so that finally we have to think about the arguments to make up our minds.
Other Minds: Critical Essays 1969-1994 (ed. Oxford University Press, 1995) - ISBN: 9780195344721