Hayek's Journey: The Mind of Friedrich Hayek (2003)
“Law, in its most general and comprehensive sense, signifies a rule of action; and is applied indiscriminately to all kinds of action, whether animate, or inanimate, rational or irrational. Thus we say, the laws of motion, of gravitation, of optics, or mechanics, as well as the laws of nature and of nations. And it is that rule of action, which is prescribed by some superior, and which the inferior is bound to obey.”
Introduction, Section II http://avalon.law.yale.edu/18th_century/blackstone_intro.asp: Of the Nature of Laws in General
Commentaries on the Laws of England (1765–1769)
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William Blackstone 15
English jurist, judge and Tory politician 1723–1780Related quotes
Hayek's Journey: The Mind of Friedrich Hayek (2003)

Barsky v. Board of Regents, 347 U.S. 442, 470 (1954).
Judicial opinions

1880s, The Sentiment of Rationality (1882)
Context: The necessity of faith as an ingredient in our mental attitude is strongly insisted on by the scientific philosophers of the present day; but by a singularly arbitrary caprice they say that it is only legitimate when used in the interests of one particular proposition, — the proposition, namely, that the course of nature is uniform. That nature will follow to-morrow the same laws that she follows to-day is, they all admit, a truth which no man can know; but in the interests of cognition as well as of action we must postulate or assume it.

Groundwork of the Metaphysics of Morals (1785)
Context: Morality is thus the relation of actions to the autonomy of the will, that is, to a possible giving of universal law through its maxims. An action that can coexist with the autonomy of the will is permitted; one that does not accord with it is forbidden. A will whose maxims necessarily harmonize with the laws of autonomy is a holy, absolutely good will. The dependence upon the principle of autonomy of a will that is not absolutely good (moral necessitation) is obligation. This, accordingly, cannot be attributed to a holy being. The objective of an action from obligation is called duty.

General Theory of Law and State (1949), I. The Concept of Law, A. Law and Justice, a. Human Behavior as the Objects of Rules

On geomatric motion. A History of the Work Concept: From Physics to Economics, by Agamenon Oliveira, p. 154.

Law and its Administration http://books.google.com/books?id=_VUf45FZR7cC&pg=PA3&dq=%22Law+as+it+exists+in+the+modern+community%22&hl=en&ei=uCLsTKahLYSs8AbQ5dWIAg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCcQ6AEwAA#v=onepage&q=%22Law%20as%20it%20exists%20in%20the%20modern%20community%22&f=false (1915), p. 3.

VIII. On Mind and Soul, and that the latter is immortal.
On the Gods and the Cosmos
Context: First, we must consider what soul is. It is, then, that by which the animate differs from the inanimate. The difference lies in motion, sensation, imagination, intelligence. Soul therefore, when irrational, is the life of sense and imagination; when rational, it is the life which controls sense and imagination and uses reason. The irrational soul depends on the affections of the body; it feels desire and anger irrationally. The rational soul both, with the help of reason, despises the body, and, fighting against the irrational soul, produces either virtue or vice, according as it is victorious or defeated.