To Charles Augustus Strong
45 Chesterton Road
Cambridge, England. November 18, 1913
[Bertrand] Russell says there are some things that it is a fallacy even to mention! They can be only predicates. I understand numbers are among them. Poor infallible arithmetic thus turns out to be guilty of original sin and to have committed a fallacy before it begins to speak. Perhaps the Pope is alone infallible after all. Russell is more English, atomistic, and nominalistic than I had supposed.
From The Letters of George Santayana: Book Two, 1910-1920. Cambridge, MA: The MIT Press, 2001.
Location of manuscript: Rockefeller Archive Center, Sleepy Hollow NY