I Can Doubt Everything, Except

How Can You Be Certain That Your Whole Life Is Not A Dream?

... 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.

... Regard This Body As A Machine Which, Having Been Made By The Hand Of God, Is Incomparably Better Ordered Than Any Machine That Can Be Devised By Man, And Contains In Itself Movements More Wonderful Than Those In Any Machine. ... It Is For All Practical Purposes Impossible For A Machine To Have Enough Organs To Make It Act In All The Contingencies Of Life In The Way In Which Our Reason Makes Us Act.

By 'god', I Understand, A Substance Which Is Infinite, Independent, Supremely Intelligent, Supremely Powerful, And Which Created Both Myself And Everything Else [...] That Exists. All These Attributes Are Such That, The More Carefully I Concentrate On Them, The Less Possible It Seems That They Could Have Originated From Me Alone. So, From What Has Been Said It Must Be Concluded That God Necessarily Exists.

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.