De Omnibus Dubitandum

Even If I Were To Suppose That I Was Dreaming And Whatever I Saw Or Imagined Was False, Yet I Could Not Deny That Ideas Were Truly In My Mind.

I Experienced In Myself A Certain Capacity For Judging Which I Have Doubtless Received From God, Like All The Other Things That I Possess; And As He Could Not Desire To Deceive Me, It Is Clear That He Has Not Given Me A Faculty That Will Lead Me To Err If I Use It Aright.

Whatever I Have Up Till Now Accepted As Most True And Assured I Have Gotten Either From The Senses Or Through The Senses. But From Time To Time I Have Found That The Senses Deceive, And It Is Prudent Never To Trust Completely Those Who Have Deceived Us Even Once.

Hence Reason Also Demands That, Since Our Thoughts Cannot All Be True Because We Are Not Wholly Perfect, What Truth They Do Possess Must Inevitably Be Found In The Thoughts We Have When Awake, Rather Than In Our Dreams.

Each Problem That I Solved Became A Rule, Which Served Afterwards To Solve Other Problems.