Introduction
Higher Mathematics for Chemical Students (1911)
“Discontinuity, then, is the essential form in which the unconscious first appears to us as a phenomenon-discontinuity, in which something is manifested as a vacillation.”
The Freudian Unconscious and Ours
The Four Fundamental Concepts of Psycho Analysis (1978)
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Jacques Lacan 20
French psychoanalyst and psychiatrist 1901–1981Related quotes

“He did not command us to give up and to discontinue all these manners of service, for”
Source: Guide for the Perplexed (c. 1190), Part III, Ch.32
Context: The custom which was in those days general among all men, and the general mode of worship in which the Israelites were brought up, consisted in sacrificing animals in those temples which contained certain images to bow down to those images, and to burn incense before them; religious and ascetic persons were in those days the persons that were devoted to the service in the temples erected to the stars... It was in accordance with the wisdom and plan of God, as displayed in the whole Creation, that He did not command us to give up and to discontinue all these manners of service, for to obey such a commandment it would have been contrary to the nature of man, who generally cleaves to that to which he is used... By this Divine plan it was effected that the traces of idolatry were blotted out, and the truly great principle of our faith, the existence and Unity of God, was firmly established; this result was thus obtained without deterring or confusing the minds of the people by the abolition of the service to which they were accustomed and which alone was familiar to them.

Igor Stravinsky (1936). An Autobiography, p. 53-54.
1930s

Symposiacs, book viii. Question IX
Bartlett's Familiar Quotations, 10th ed. (1919)

Source: A Treatise On Political Economy (Fourth Edition) (1832), Book I, On Production, Chapter XV, p. 133 (See also: Say's Law)
Context: A man who applies his labour to the investing of objects with value by the creation of utility of some sort, can not expect such a value to be appreciated and paid for, unless where other men have the means of purchasing it. Now, of what do these means consist? Of other values of other products, likewise the fruits of industry, capital, and land. Which leads us to a conclusion that may at first appear paradoxical, namely, that it is production which opens a demand for products.