I Know That I Exist;

I Think; Therefore I Am.

... Moral Certainty Is Certainty Which Is Sufficient To Regulate Our Behaviour, Or Which Measures Up To The Certainty We Have On Matters Relating To The Conduct Of Life Which We Never Normally Doubt, Though We Know That It Is Possible, Absolutely Speaking, That They May Be False.

If I Simply Refrain From Making A Judgment In Cases Where I Do Not Perceive The Truth With Sufficient Clarity And Distinctness, Then It Is Clear That I Am Behaving Correctly And Avoiding Error.

Good Sense Is, Of All Things Among Men, The Most Equally Distributed; For Every One Thinks Himself So Abundantly Provided With It, That Those Even Who Are The Most Difficult To Satisfy In Everything Else, Do Not Usually Desire A Larger Measure Of This Quality Than They Already Possess.

Whatever I Have Up Till Now Accepted As Most True And Assured I Have Gotten Either From The Senses Or Through The Senses. But From Time To Time I Have Found That The Senses Deceive, And It Is Prudent Never To Trust Completely Those Who Have Deceived Us Even Once.