... The Science We Are After Is

A Young Man Is Not A Proper Hearer Of Lectures On Political Science; For He Is Inexperienced In The Actions That Occur In Life, But Its Discussions Start From These And Are About These; And, Further, Since He Tends To Follow His Passions, His Study Will Be Vain And Unprofitable, Because The End That Is Aimed At Is Not Knowledge But Action. And It Makes No Difference Whether He Is Young In Years Or Youthful In Character.

One Citizen Differs From Another, But The Salvation Of The Community Is The Common Business Of Them All. This Community Is The Constitution; The Virtue Of The Citizen Must Therefore Be Relative To The Constitution Of Which He Is A Member.

Those Who Are Not Angry At The Things They Should Be Angry At Are Thought To Be Fools, And So Are Those Who Are Not Angry In The Right Way, At The Right Time, Or With The Right Persons.

We Cannot ... Prove Geometrical Truths By Arithmetic.

The Line Has Magnitude In One Way, The Plane In Two Ways, And The Solid In Three Ways, And Beyond These There Is No Other Magnitude Because The Three Are All.