The Only Secure Knowledge Is That I

Neither The True Nor The False Roots Are Always Real; Sometimes They Are Imaginary; That Is, While We Can Always Imagine As Many Roots For Each Equation As I Have Assigned, Yet There Is Not Always A Definite Quantity Corresponding To Each Root We Have Imagined.

Doubt Is The Origin Of Wisdom

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

It Is Not Enough To Have A Good Mind. The Main Thing Is To Use It Well.

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.