I Think; Therefore I Am.

Mathematics Is A More Powerful Instrument Of Knowledge Than Any Other That Has Been Bequeathed To Us By Human Agency.

[about Pierre De Fermat] It Cannot Be Denied That He Has Had Many Exceptional Ideas, And That He Is A Highly Intelligent Man. For My Part, However, I Have Always Been Taught To Take A Broad Overview Of Things, In Order To Be Able To Deduce From Them General Rules, Which Might Be Applicable Elsewhere.

At Last I Will Devote Myself Sincerely And Without Reservation To The General Demolition Of My Opinions.

Even Those Who Have The Weakest Souls Could Acquire Absolute Mastery Over All Their Passions If We Employed Sufficient Ingenuity In Training And Guiding Them.

Thus Each Truth Discovered Was A Rule Available In The Discovery Of Subsequent Ones.