General principles are not the less true or important because from their nature they elude immediate observation; they are like the air, which is not the less necessary because we neither see nor feel it.
William Hazlitt (1809). “The Eloquence of the British Senate: Being a Selection of the Best Speeches of the Most Distinguished English, Irish, and Scotch Parliamentary Speakers, from the Beginning of the Reign of Charles I. to the Present Time”, p.209
