Nothing Comes Out Of Nothing.

I Was Convinced That Our Beliefs Are Based Much More On Custom And Example Than On Any Certain Knowledge.

Intuition Is The Undoubting Conception Of A Pure And Attentive Mind, Which Arises From The Light Of Reason Alone, And Is More Certain Than Deduction.

I Know That I Exist; The Question Is, What Is This 'i' That 'i' Know.

The Reading Of All Good Books Is Indeed Like A Conversation With The Noblest Men Of Past Centuries Who Were The Authors Of Them, Nay A Carefully Studied Conversation, In Which They Reveal To Us None But The Best Of Their Thoughts.

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