Except Our Own Thoughts, There Is Nothing

But I Cannot Forget That, At Other Times I Have Been Deceived In Sleep By Similar Illusions; And, Attentively Considering Those Cases, I Perceive So Clearly That There Exist No Certain Marks By Which The State Of Waking Can Ever Be Distinguished From Sleep, That I Feel Greatly Astonished; And In Amazement I Almost Persuade Myself That I Am Now Dreaming.

I Concluded That I Might Take As A General Rule The Principle That All Things Which We Very Clearly And Obviously Conceive Are True: Only Observing, However, That There Is Some Difficulty In Rightly Determining The Objects Which We Distinctly Conceive.

God Alone Is The Author Of All The Motions In The World.

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.

And I Shall Always Hold Myself More Obliged To Those By Whose Favour I Enjoy Uninterrupted Leisure Than To Any Who Might Offer Me The Most Honourable Positions In The World.