I Think; Therefore I Am.

I Hope That Posterity Will Judge Me Kindly, Not Only As To The Things Which I Have Explained, But Also To Those Which I Have Intentionally Omitted So As To Leave To Others The Pleasure Of Discovery.

In Philosophy, When We Make Use Of False Principles, We Depart The Farther From The Knowledge Of Truth And Wisdom Exactly In Proportion To The Care With Which We Cultivate Them, And Apply Ourselves To The Deduction Of Diverse Consequences From Them, Thinking That We Are Philosophizing Well, While We Are Only Departing The Farther From The Truth; From Which It Must Be Inferred That They Who Have Learned The Least Of All That Has Been Hitherto Distinguished By The Name Of Philosophy Are The Most Fitted For The Apprehension Of Truth.

Even If I Were To Suppose That I Was Dreaming And Whatever I Saw Or Imagined Was False, Yet I Could Not Deny That Ideas Were Truly In My Mind.

I Know That I Exist; The Question Is, What Is This 'i' That 'i' Know.

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