All Is To Be Doubted.

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

Neither Divine Grace Nor Natural Knowledge Ever Diminishes Freedom.

Let Whoever Can Do So Deceive Me, He Will Never Bring It About That I Am Nothing, So Long As I Continue To Think I Am Something.

Some Years Ago I Was Struck By The Large Number Of Falsehoods That I Had Accepted As True In My Childhood, And By The Highly Doubtful Nature Of The Whole Edifice That I Had Subsequently Based On Them. I Realized That It Was Necessary, Once In The Course Of My Life, To Demolish Everything Completely And Start Again Right From The Foundations If I Wanted To Establish Anything At All In The Sciences That Was Stable And Likely To Last.