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Источник: The Theory of Political Economy (1871), Chapter IV, Theory of Exchange, p. 108.

Источник: The Theory of Political Economy (1871), Chapter I, Introduction, p. 53.

Preface To The Second Edition, p. 9.
The Theory of Political Economy (1871)

Источник: The Theory of Political Economy (1871), Chapter I, Introduction, p. 44.
Контексте: A correct theory is the first step towards improvement, by showing what we need and what we might accomplish.

Preface To The Second Edition, p. 6.
The Theory of Political Economy (1871)
Контексте: A correspondent, Captain Charles Christie R. E., to whom I have shown these sections after they were printed, objects reasonably enough that commodity should not have been represented by M, or Mass, but by some symbol, for instance Q, which would include quantity of space or time or force, in fact almost any kind of quantity.

The Substitution of Similars, The True Principles of Reasoning (1869)
Контексте: Aristotle's dictim... may then be formulated somewhat as follows:—Whatever is known of a term may be stated of its equal or equivalent. Or, in other words, Whatever is true of a thing is true of its like.... the value of the formula must be judged by its results;... it not only brings into harmony all the branches of logical doctrine, but... unites them in close analogy to the corresponding parts of mathematical method. All acts of mathematical reasoning may... be considered but as applications of a corresponding axiom of quantity...

The Substitution of Similars, The True Principles of Reasoning (1869)
Контексте: Aristotle's dictim... may then be formulated somewhat as follows:—Whatever is known of a term may be stated of its equal or equivalent. Or, in other words, Whatever is true of a thing is true of its like.... the value of the formula must be judged by its results;... it not only brings into harmony all the branches of logical doctrine, but... unites them in close analogy to the corresponding parts of mathematical method. All acts of mathematical reasoning may... be considered but as applications of a corresponding axiom of quantity...

Letter to Henrietta Jevons (28 February 1858), published in Letters and Journal of W. Stanley Jevons (1886), edited by Harriet A. Jevons, his wife, p. 101.
Контексте: You will perceive that economy, scientifically speaking, is a very contracted science; it is in fact a sort of vague mathematics which calculates the causes and effects of man's industry, and shows how it may be best applied. There are a multitude of allied branches of knowledge connected with mans condition; the relation of these to political economy is analogous to the connexion of mechanics, astronomy, optics, sound, heat, and every other branch more or less of physical science, with pure mathematics.

Letter to Edward Pease (1821-04-28)

Dr. Paris, Life of Sir Humphry Davy (1831)

Letter to Joseph Sandars (December 1824)

Война есть средство бегства от нерешенных проблем в мирное время.
Вариант: Война — всего лишь трусливое бегство от проблем мирного времени.