“For the fortunate amongst us, the fourth danger”

fr. 119
Purifications

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LXXXVIII: On liberal and vocational studies

1830s, The Lyceum Address (1838)
Context: At what point shall we expect the approach of danger? By what means shall we fortify against it? — Shall we expect some transatlantic military giant, to step the Ocean, and crush us at a blow? Never! — All the armies of Europe, Asia and Africa combined, with all the treasure of the earth (our own excepted) in their military chest; with a Buonaparte for a commander, could not by force, take a drink from the Ohio, or make a track on the Blue Ridge, in a trial of a thousand years.
At what point then is the approach of danger to be expected? I answer, if it ever reach us, it must spring up amongst us. It cannot come from abroad. If destruction be our lot, we must ourselves be its author and finisher. As a nation of freemen, we must live through all time, or die by suicide.

"Why Physical Space has Three Dimensions," British Journal for the Philosophy of Science, 6 #21 (May 1955)
Context: Perhaps the first to approach the fourth dimension from the side of physics, was the Frenchman, Nicole Oresme, of the fourteenth century. In a manuscript treatise, he sought a graphic representation of the Aristotelian forms, such as heat, velocity, sweetness, by laying down a line as a basis designated longitudo, and taking one of the forms to be represented by lines (straight or circular) perpendicular to this either as a latitudo or an altitudo. The form was thus represented graphically by a surface. Oresme extended this process by taking a surface as the basis which, together with the latitudo, formed a solid. Proceeding still further, he took a solid as a basis and upon each point of this solid he entered the increment. He saw that this process demanded a fourth dimension which he rejected; he overcame the difficulty by dividing the solid into numberless planes and treating each plane in the same manner as the plane above, thereby obtaining an infinite number of solids which reached over each other. He uses the phrase "fourth dimension" (4am dimensionem).

Source: Water Sleeps (1999), Chapter 30 (p. 112)

Annotated Drawings by Eugene J. Martin: 1977-1978

First Treatise of Government
Two Treatises of Government (1689)
Context: The imagination is always restless and suggests a variety of thoughts, and the will, reason being laid aside, is ready for every extravagant project; and in this State, he that goes farthest out of the way, is thought fittest to lead, and is sure of most followers: And when Fashion hath once Established, what Folly or craft began, Custom makes it Sacred, and 'twill be thought impudence or madness, to contradict or question it. He that will impartially survey the Nations of the World, will find so much of the Governments, Religion, and Manners brought in and continued amongst them by these means, that they will have but little Reverence for the Practices which are in use and credit amongst Men.

Minnesota v. Dickerson, 508 U.S. 366 http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=US&vol=508&invol=366 (1993) (concurring).
1990s

Act II, scene i.
Cato, A Tragedy (1713)