“The single statement, the brief formula, the few words of which replace in our minds a wide range of relationships between isolated phenomena, is what we term a scientific law. Such a law, relieving our memory from the burden of individual sequences, enables us, with the minimum of intellectual fatigue, to grasp a vast complexity of natural or social phenomena. The discovery of law is... the peculiar function of the creative imagination. But this imagination has to be a disciplined one.”

— Karl Pearson, book The Grammar of Science

Introductory
The Grammar of Science (1900)

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Karl Pearson65

English mathematician and biometrician 1857–1936

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“The last decades of scientific development have led us to the recognition of a new universal law of all natural phenomena, which, from its extraordinarily extended range, and from the connection which it constitutes between natural phenomena of all kinds, even of the remotest times and the most distant places, is especially fitted to give us an idea of what I have described as the character of the natural sciences, which I have chosen as the subject of this lecture.”

Hermann von Helmholtz (1821–1894) physicist and physiologist

"On the Conservation of Force" (1862), p. 279
Popular Lectures on Scientific Subjects (1881)

“An essential distinction exists between two stages in the process of advancing our knowledge of the laws of physical phenomena; the first stage consists in observing the relations of phenomena, whether of such as occur in the ordinary course of nature, or of such as are artificially produced in experimental investigations, and in expressing the relations so observed by propositions called formal laws. The second stage consists in reducing the formal laws of an entire class of phenomena to the form of a science; that is to say, in discovering the most simple system of principles, from which all the formal laws of the class of phenomena can be deduced as consequences.”

William John Macquorn Rankine (1820–1872) civil engineer

Source: "Outlines of the Science of Energetics," (1855), p. 121; Lead paragraph: Section "What Constitutes A Physical Theory"

“Law is an order of human behavior. An “order” is a system of rules. Law is not, as it is sometimes said, a rule. It is a set of rules having the kind of unity we understand by a system. It is impossible to grasp the nature of law if we limit our attention to the single isolated rule.”

Hans Kelsen (1881–1973) Austrian lawyer

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

“When... a simple principle has been discovered... then this principle or law itself generally leads to the discovery of a still wider range of hitherto unregarded phenomena... Every great advance of science opens our eyes to facts which we had failed before to observe, and makes new demands...”

Karl Pearson book The Grammar of Science

Introductory
The Grammar of Science (1900)

“We define law, using the word in the philosophic sense, as the constant relation discoverable in a series of phenomena.”

Michel Bréal (1832–1915) French philologist

Source: Essai de semantique, 1897, p. 11

“[Biology has] become the paramount science, exceeding other disciplines, including physics and chemistry at least, in the creative tumult of its disciplines and disputations. […] I'll also be so bold at this point to suggest that we are now at the edge of establishing the two fundamental laws of biology: The first law is that all of the phenomena of biology, the entities and the processes, are ultimately obedient to the laws of physics and chemistry. Not immediately reducible to them, but ultimately consistent and in consilience with them, by a cause and effect explanation. The second law is that all biological phenomena, these entities and processes that define life itself, have arisen by evolution through natural selection.”

Edward O. Wilson (1929) American biologist

Talk at the 50th anniversary of New Scientist magazine (2006).

“By determining law — so far as it is the subject of a specific science of law — as norm, it is delimited against nature; and science of law against natural science. But in addition to legal norms, there are other norms regulating the behavior of men to each other, that is, social norms; and the science of law is therefore not the only discipline directed toward the cognition and description of social norms. There other social norms may be called “morals.” and the discipline directed toward their cognition and description, “ethics.” So far as justice is a postulate of morals, the relationship between justice and law is included in the relationship between morals and law.”

Hans Kelsen book Pure Theory of Law

Pure Theory of Law (revised ed., 1960), 7. Moral Norms as Social Norms

“The mind has an outlook which transcends the natural law by which it functions.”

Arthur Stanley Eddington (1882–1944) British astrophysicist

Science and the Unseen World (1929), V, p.56

“Hundreds of men have allowed their imagination to solve the universe, but the men who have contributed to our real understanding of natural phenomena have been those who were unstinting in their application of criticism to the product of their imaginations. It is such criticism which is the essence of the scientific use of the imagination, which is... the very life-blood of science.”

Karl Pearson book The Grammar of Science

Introductory
The Grammar of Science (1900)

“[W]hen the law is reached... it must be tested and criticised by its discoverer in every conceivable way, till he is certain that the imagination has not played him false, and that his law is in real agreement with the whole group of phenomena...”

Karl Pearson book The Grammar of Science

Introductory
The Grammar of Science (1900)

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