De Omnibus Dubitandum

But I Cannot Forget That, At Other Times I Have Been Deceived In Sleep By Similar Illusions; And, Attentively Considering Those Cases, I Perceive So Clearly That There Exist No Certain Marks By Which The State Of Waking Can Ever Be Distinguished From Sleep, That I Feel Greatly Astonished; And In Amazement I Almost Persuade Myself That I Am Now Dreaming.

There Is Nothing More Ancient Than The Truth.

The Nature Of Matter, Or Body Considered In General, Consists Not In Its Being Something Which Is Hard Or Heavy Or Coloured, Or Which Affects The Senses In Any Way, But Simply In Its Being Something Which Is Extended In Length, Breadth And Depth.

I Am Indeed Amazed When I Consider How Weak My Mind Is And How Prone To Error.

Be That As It May, There Is Fixed In My Mind A Certain Opinion Of Long Standing, Namely That There Exists A God Who Is Able To Do Anything And By Whom I, Such As I Am, Have Been Created. How Do I Know That He Did Not Bring It About That There Is No Earth At All, No Heavens, No Extended Thing, No Shape, No Size, No Place, And Yet Bringing It About That All These Things Appear To Me To Exist Precisely As They Do Now?