In Order To Improve The Mind, We

De Omnibus Dubitandum

Omnia Apud Me Mathematica Fiunt.

On The One Hand I Have A Clear And Distinct Idea Of Myself, In So Far As I Am A Thinking, Non-extended Thing; And On The Other Hand I Have A Distinct Idea Of Body, In So Far A This Is Simply An Extended, Non-thinking Thing. And, Accordingly, It Is Certain That I Am Really Distinct From My Body, And Exist Without It.

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

The Only Secure Knowledge Is That I Exist.