I Think; Therefore I Am.

Archimedes, That He Might Transport The Entire Globe ... Demanded Only A Point That Was Firm And Immovable; So Also, I Shall Be Entitled To Entertain The Highest Expectations, If I Am Fortunate Enough To Discover Only One Thing That Is Certain And Indubitable.

So Blind Is The Curiosity By Which Mortals Are Possessed, That They Often Conduct Their Minds Along Unexplored Routes, Having No Reason To Hope For Success, But Merely Being Willing To Risk The Experiment Of Finding Whether The Truth They Seek Lies There.

There Is A Difference Between Happiness, The Supreme Good, And The Final End Or Goal Toward Which Our Actions Ought To Tend. For Happiness Is Not The Supreme Good, But Presupposes It, Being The Contentment Or Satisfaction Of The Mind Which Results From Possessing It.

Human Wisdom Remains Always One And The Same Although Applied To The Most Diverse Objects And It Is No More Changed By Their Diversity Than The Sunshine Is Changed By The Variety Of Objects Which It Illuminates.

What Then Is The Source Of My Errors? They Are Owing Simply To The Fact That, Since The Will Extends Further Than The Intellect, I Do Not Contain The Will Within The Same Boundaries; Rather, I Also Extend It To Things I Do Not Understand. Because The Will Is Indifferent In Regard To Such Matters, It Easily Turns Away From The True And The Good; And In This Way I Am Deceived And I Sin.