I Know That I Exist; The Question

Illusory Joy Is Often Worth More Than Genuine Sorrow.

Neither Divine Grace Nor Natural Knowledge Ever Diminishes Freedom.

If ... It Is Not In My Power To Arrive At The Knowledge Of Any Truth, I May At Least Do What Is In My Power, Namely, Suspend Judgement.

If We Possessed A Thorough Knowledge Of All The Parts Of The Seed Of Any Animal (e.g. Man), We Could From That Alone, Be Reasons Entirely Mathematical And Certain, Deduce The Whole Conformation And Figure Of Each Of Its Members, And, Conversely If We Knew Several Peculiarities Of This Conformation, We Would From Those Deduce The Nature Of Its Seed.

Here I Beg You To Observe In Passing That The Scruples That Prevented Ancient Writers From Using Arithmetical Terms In Geometry, And Which Can Only Be A Consequence Of Their Inability To Perceive Clearly The Relation Between These Two Subjects, Introduced Much Obscurity And Confusion Into Their Explanations.