Science Is Practical Philosophy.

...it Is Certain That I Am Really Distinct From My Body, And Can Exist Without It.

It Is To The Body Alone That We Should Attribute Everything That Can Be Observed In Us To Oppose Our Reason.

And As It Is The Most Generous Souls Who Have Most Gratitude, It Is Those Who Have Most Pride, And Who Are Most Base And Infirm, Who Most Allow Themselves To Be Carried Away By Anger And Hatred.

This Result Could Have Been Achieved Either By His [god] Endowing My Intellect With A Clear And Distinct Perception Of Everything About Which I Would Ever Deliberate, Or Simply By Impressing The Following Rule So Firmly Upon My Memory That I Could Never Forget It: I Should Never Judge Anything That I Do Not Clearly And Distinctly Understand.

I Experienced In Myself A Certain Capacity For Judging Which I Have Doubtless Received From God, Like All The Other Things That I Possess; And As He Could Not Desire To Deceive Me, It Is Clear That He Has Not Given Me A Faculty That Will Lead Me To Err If I Use It Aright.