Authority Is No Source For Truth.

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.

We Can't Learn Without Pain.

The Best Way To Teach Morality Is To Make It A Habit With Children.

That Which Is Impossible And Probable Is Better Than That Which Is Possible And Improbable.

The Moral Virtues, Then, Are Produced In Us Neither By Nature Nor Against Nature. Nature, Indeed, Prepares In Us The Ground For Their Reception, But Their Complete Formation Is The Product Of Habit.