Common Sense Is The Best Distributed Thing

To Live Without Philosophizing Is In Truth The Same As Keeping The Eyes Closed Without Attempting To Open Them.

Conquer Yourself Rather Than The World.

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.

Divide Each Difficulty Into As Many Parts As Is Feasible And Necessary To Resolve It.

So Far, I Have Been A Spectator In This Theater Which Is The World, But I Am Now About To Mount The Stage, And I Come Forward Masked.