A History of Western Philosophy: And Its Connection with Political and Social Circumstances from the Earliest Times to the Present Day

by Bertrand Russell

Now a belief, provided it is sufficiently simple, may exist without being expressed in words. It would be difficult, without using words, to believe that the ratio of the circumference of a circle to the diameter is approximately 3.14159, or that Caesar, when he decided to cross the Rubicon, sealed the fate of the Roman republican constitution.