How Can You Be Certain That Your

Here I Beg You To Observe In Passing That The Scruples That Prevented Ancient Writers From Using Arithmetical Terms In Geometry, And Which Can Only Be A Consequence Of Their Inability To Perceive Clearly The Relation Between These Two Subjects, Introduced Much Obscurity And Confusion Into Their Explanations.

De Omnibus Dubitandum

For I Found Myself Embarrassed With So Many Doubts And Errors That It Seemed To Me That The Effort To Instruct Myself Had No Effect Other Than Th Eincreasing Discovery Of My Own Ignorance

I Accept No Principles Of Physics Which Are Not Also Accepted In Mathematics.

Common Sense Is The Best Distributed Thing In The World, For We All Think We Possess A Good Share Of It.