Each Problem That I Solved

How Can You Be Certain That Your Whole Life Is Not A Dream?

At Last I Will Devote Myself Sincerely And Without Reservation To The General Demolition Of My Opinions.

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.

Every Man Is Indeed Bound To Do What He Can To Promote The Good Of Others, And A Man Who Is Of No Use To Anyone Is Strictly Worthless.

With Me, Everything Turns Into Mathematics.